Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
How can you tell when a quadratic equation has no real solutions?
A. when the radicand is negative
B. when b in the quadratic formula is greater than the radicand
C. when the radicand equals zero
D. when the radicand is not a perfect square
I believe the answer is A? is that right?
 2 years ago
 2 years ago
How can you tell when a quadratic equation has no real solutions? A. when the radicand is negative B. when b in the quadratic formula is greater than the radicand C. when the radicand equals zero D. when the radicand is not a perfect square I believe the answer is A? is that right?
 2 years ago
 2 years ago

This Question is Closed

campbell_stBest ResponseYou've already chosen the best response.3
its A using the discriminant \[b^2  4ac\] < 0 no real solutions the radical will be negative
 2 years ago

experimentXBest ResponseYou've already chosen the best response.1
whats radicand anyway??
 2 years ago

campbell_stBest ResponseYou've already chosen the best response.3
the square root symbol
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
\[x=\frac{b \pm \sqrt{b^24ac}}{2a}\]
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
Thanks!! :) I also have this one... For which value of x does the graph of y = 2x2 − 7x + 6 cross the xaxis? A. −3/2 B. −2/3 C. 2 D. 3 I think its C.
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
\[b^24ac\] is the discriminant
 2 years ago

campbell_stBest ResponseYou've already chosen the best response.3
you can substitute each value to find y = 0 or factorise (2x  3)(x  2) = 0 x = 3/2 and 2
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
Thanks so much, here's another one i'm stuck on... What are the approximate solutions of 4x2 + 3 = −12x to the nearest hundredth? A. x ≈ −3.23 and x ≈ 0.23 B. x ≈ −2.72 and x ≈ −0.28 C. x ≈ 0.28 and x ≈ 2.72 D. x ≈ −0.23 and x ≈ 3.23 I think its C, but I'm not sure??
 2 years ago

campbell_stBest ResponseYou've already chosen the best response.3
put it in standard form 4x^2 + 12x + 3 = 0 use the general quadratic formula \[x = (b \pm \sqrt{b^2  4ac})/2a\] in your question a = 4, b = 12 and c = 3
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
Both roots are negative.
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
B? Really? are you sure?
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
Okay, i'll trust you! :)
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
\[x=\frac{12\pm \sqrt{96}}{8}\]
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
I have one more question that's really confusing me, would you mind sticking around for one more?
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
\[x=\frac{12+9.80}{8} or x=\frac{129.80}{8}\]
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
*note* don't ask me why the numbers are spreed out like that, I just copied and pasted it onto here, that how it looks on my paper. Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring? −b b2 − 4ac 2a Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
Well which part would you choose? b? 2a????
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
\[b^24ac=7^24(2)(3)=4924=25\]
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
I don't know... This is really confusing me for some reason...
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
so the answer is b^24ac?
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
I'm still confused... :/
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
or is the answer this: b²  4ac = (7)²  4(2)(3) = 49  24 = 25.
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
The discriminant, which is b^24ac, is the part of the quadratic formula which tells you about the roots.
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
Do you understand that the question has two parts? READ THE QUESTION!!!
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
PART 1: Which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring?
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
The answer to that is :b^24ac
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
PART 2: Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation: 2x2 + 7x + 3 = 0
 2 years ago

MertsjBest ResponseYou've already chosen the best response.0
The answer to that is 25
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
ohhh okay, I understand now
 2 years ago

Renee99Best ResponseYou've already chosen the best response.0
I just wasn't looking at the problem correctly, sorry for the confusion and thanks again for breaking it down for me
 2 years ago
See more questions >>>
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.