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miah
Group Title
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
miah Group Title
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

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

RadEn Group TitleBest 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

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

waterineyes Group TitleBest 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

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

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

waterineyes Group TitleBest 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

RadEn Group TitleBest 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

miah Group TitleBest 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

RadEn Group TitleBest ResponseYou've already chosen the best response.0
hehe, good tricky :)
 one year ago

waterineyes Group TitleBest 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

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