A community for students.
Here's the question you clicked on:
 0 viewing
Swageraid32
 3 years ago
@tcarroll010 can you help me with 4 and 5 of this....
Swageraid32
 3 years ago
@tcarroll010 can you help me with 4 and 5 of this....

This Question is Closed

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1those are my last two please........... ;/

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.0# 4 D = b^2  4ac D = (1)^2  4(0.05)(1) D = ???

shyLove98
 3 years ago
Best ResponseYou've already chosen the best response.0I'm sorry. I don't know any of this. I tried. I'm really really really sorry. :(((

phi
 3 years ago
Best ResponseYou've already chosen the best response.1if you have a the equation of a parabola in standard form: y= ax^2 + bx +c you match up the coefficients of your equation with a, b, and c then use those numbers for a, b, and c in the formula discriminant= b^2 4ac jim_t already did most of the work for you.

phi
 3 years ago
Best ResponseYou've already chosen the best response.1y= 0.05 x^2 + 1x + 1 is your equation

evergirl
 3 years ago
Best ResponseYou've already chosen the best response.0I think phi has got you covered

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1you mean that is how i do the quadratic part??

phi
 3 years ago
Best ResponseYou've already chosen the best response.1we are doing question 4. They want to know the discriminant (of your quadratic equation) I assume they mean the equation they give in question 1 To find the discriminant we first do step 1: first step: pattern match y= 0.05 x^2 + 1x + 1 y= a x^2 +b x + c what is a,b, and c?

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1i have that part i need number 5

phi
 3 years ago
Best ResponseYou've already chosen the best response.1what did you get for a, b and c

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1wait what?? like for the explanation part??

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1D = (1)^2  4(0.05)(1)

phi
 3 years ago
Best ResponseYou've already chosen the best response.1I see you copied Jim's answer To find the discriminant we first do step 1: first step: pattern match y= 0.05 x^2 + 1x + 1 y= a x^2 +b x + c what is a,b, and c?

phi
 3 years ago
Best ResponseYou've already chosen the best response.1almost, b is just 1 (we only want the numbers. a= 0.05, b=1 , c=1 step 2: replace the letters a, b, and c in b^2  4ab with the numbers you just found (remember b^2 is short for b*b 4ab is short for 4*a*b * means multiply

phi
 3 years ago
Best ResponseYou've already chosen the best response.1now what is 1^2 ? 1*1 = 1 4*0.05 is 0.2 0.2*1 is 0.2 so 1 .2 = 0.8 the discriminant is 0.8

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1ok i get that thanks for actually working with me and not giving just the answer :D

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1so could you assist me in #5 as well??

phi
 3 years ago
Best ResponseYou've already chosen the best response.1For 5, the quadratic formula is \[ x=\frac{−b±\sqrt{b^2−4ac}}{2a}\] notice that the stuff inside the square root is the "discriminant", which you already figured out is 0.8 you also know what a, b and c are. So replace the letters with numbers what do you get?

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1a=0.05, b=1, c=1 \[x=\frac{−1±\sqrt{1^2 4\times0.05\times1}}{2\times0.05}\]

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1@phi ?? like that??

phi
 3 years ago
Best ResponseYou've already chosen the best response.1I just noticed that the equation you have from question 1 should be y= 0.05x^2 x +1 notice that b is 1 (not +1) this changes your answers (gack!)

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1yea i know it is a typo the graph is wrong

phi
 3 years ago
Best ResponseYou've already chosen the best response.1if we use b= 1 we get \[x= \frac{1 ± \sqrt{0.8}}{0.1}= 10±\sqrt{80} = 10± 4\sqrt{5} \] you get two answers x= 10+4sqrt(5) and x= 104sqrt(5) these are where the graph crosses the xaxis

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1the part like so i need to switch it to a 1?

phi
 3 years ago
Best ResponseYou've already chosen the best response.1It's your call. The question says find the equation, from the graph. Did you find the equation from the graph? If so, you got it wrong?

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1o wow no i used the graph that was provided on the graph ;( that means i have to go back and do this all again :/

phi
 3 years ago
Best ResponseYou've already chosen the best response.1Q1 general equation is y=0.05 x^2 x +1 vertex form is 0.05(x10)^2  4

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1so that means its this? y= 0.05 x^2 1x + 1

phi
 3 years ago
Best ResponseYou've already chosen the best response.1in Q2, the 10 become +10 so that means its this? y= 0.05 x^2 1x + 1 Yes

phi
 3 years ago
Best ResponseYou've already chosen the best response.1in Q2, the domain are all valid x's in this case, inf to +infinity

phi
 3 years ago
Best ResponseYou've already chosen the best response.1in Q2, the range is all y values. from the graph, you see y is always bigger than 4

phi
 3 years ago
Best ResponseYou've already chosen the best response.1in Q3, your xintercepts should be positive

phi
 3 years ago
Best ResponseYou've already chosen the best response.1in Q4, b is 1 not +1, but it won't change the discriminant calculation.

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1ok thanks for all that :D

Swageraid32
 3 years ago
Best ResponseYou've already chosen the best response.1i do need your help again though i mean how are you supposed to find the domain and range? @phi
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.