Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Solve. 5x2 – 20 = 0
x = 5 and x = 4
x = 4 and x = 2
x = –5 and x = 20
x = 2 and x = –2
 one year ago
 one year ago
Solve. 5x2 – 20 = 0 x = 5 and x = 4 x = 4 and x = 2 x = –5 and x = 20 x = 2 and x = –2
 one year ago
 one year ago

This Question is Closed

waterineyesBest ResponseYou've already chosen the best response.0
You can start by: Dividing both the sides by 5..
 one year ago

RadEnBest ResponseYou've already chosen the best response.0
factorize by using the difference squares formula a^2  b^2 = (a+b)(ab)
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
And you can use here : \[x^2  a^2 = (x + a) (x  a)\]
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
Or if you don't wanna do this, then add 4 both the sides and then take square root both the sides.
 one year ago

miahBest ResponseYou've already chosen the best response.0
so,... whats the answer ?
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
Who told you that answer is B?
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
\(x^2  4 = 0\) Add 4 both the sides and tell me what did you get?
 one year ago

RadEnBest ResponseYou've already chosen the best response.0
well, look at how the factorization works x^2  4 = 0 x^2  2^2 = 0 use the diff square formula, (x+2)(x2) = 0 solve for x find the zeroes by make each factor be zero first, x+2=0 subtract by 2 from both sides, x+22 = 02 x = 2 do for the rest!
 one year ago

miahBest ResponseYou've already chosen the best response.0
I dont really have to do the rest because there isnt another 2 in the other choices.
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
do for the rest is actually for your own knowledge and not for answer choices you are given with..
 one year ago

RadEnBest ResponseYou've already chosen the best response.0
ok, show to us how to solve of x  2 = 0 ?
 one year 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.