Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

jamesmBest ResponseYou've already chosen the best response.0
quadratic formula: x = (9 + sqrt(45))/2 = (9 + 3*sqrt(5))/2 = 3(3 + sqrt(5))/2
 2 years ago

RohangrrBest ResponseYou've already chosen the best response.2
here's a Example Solve the equation: x2  9x + 20 = 0 Solution First, factorise the quadratic equation x2 9x + 20 = 0 Find two numbers which add up to 9 and multiply to give 20. These numbers are 4 and 5. (x  4) (x  5) = 0 Now find the value x so that when these brackets are multiplied together the answer is 0. This means either (x  4) = 0 or (x  5) = 0 So x = 4 or x = 5. You can check these answers by substitutuing 4 and 5 in to the equation: x2 9x + 20 Substituting 4 gives: 42  9 × 4 + 20 = 16  36 + 20 = 0 Substituting 5 gives: 52  9 × 5 + 20 = 25  45 + 20 = 0 Remember these 3 simple steps and you will be able to solve quadratic equations. quadratic formula: x = (9 + sqrt(45))/2 = (9 + 3*sqrt(5))/2 = 3(3 + sqrt(5))/2
 2 years ago

RohangrrBest ResponseYou've already chosen the best response.2
it will help u more than the solution
 2 years ago

mckayla_04Best ResponseYou've already chosen the best response.0
okay.. then what about 2x2 – 8x = –7?
 2 years ago

lgbasalloteBest ResponseYou've already chosen the best response.0
just use what you have learned from their statements...the form of a quadratic equation is ax^2 + bx + c = 0 the quad formula is: x = b + sqrt (b^2  4(a)(c) ) all over 2a try :DD
 2 years ago

RohangrrBest ResponseYou've already chosen the best response.2
2x^2  8x + 7 = 0 (x  1) x (2x  7) = 0 You get an F if you can't finish it from here. Late edit: 8x. Crap use the equation to solve. ok. 2X^2  8X + 7 = 0 2(X^2  4X) + 7 = 0 2(X^2  4X + 4)  8 + 7 = 0 2(X2)^2  1 = 0 (X2)^2 = 1/2 X  2 = sqrt(1/2) X = 2 + sqrt(1/2) Or X = sqrt 2 x (sqrt 2 + 1) Or X = (4 + sqrt 2)/2.........your pref.
 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.