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careoh
Group Title
How to find the SUM of the solution of the equation:
8x^2+40x=16x
 2 years ago
 2 years ago
careoh Group Title
How to find the SUM of the solution of the equation: 8x^2+40x=16x
 2 years ago
 2 years ago

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SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
8x^2 + 40x = 16x (16x) 8x^2 + 32x = 0 8x(x + 4) = 0 I'll let you take it from here.
 2 years ago

patbatE21 Group TitleBest ResponseYou've already chosen the best response.0
Set 8x = 0 and (x +4) = 0 , then the results add together
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
Correct, since it asks for the sum. You get two results, one from either factor.
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
Thanks! How did you get 32x?
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
By subtracting 16x from both sides and then grouping like terms. Like this: 8x^2 +40x = 16x 8x^2 +40x 16x = 16x16x 8x^2 +32x = 0
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
So you subtracted 16x16x, do you also subtract 40x16x? If so, wouldn't that equal 24x?
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
Yes. Haha thank you for catching that.
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
Embarassing.
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
haha. It's okay!
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
So after, do you divide each by 8?
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
Yeah. I get 8x^2 + 24x = 0 and you can take out a factor of 8x
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
So the answer would be 3?
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
Kind of almost.
 2 years ago

SmoothMath Group TitleBest ResponseYou've already chosen the best response.1
You get a factor of (x+3) What x makes that factor 0?
 2 years ago

patbatE21 Group TitleBest ResponseYou've already chosen the best response.0
you can factor out as 4x(2x+6) then set both to zero and you should end up with x= 0 & x = 3 and add them
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
So the answer is 3?
 2 years ago

careoh Group TitleBest ResponseYou've already chosen the best response.0
That was easy! Thanks you guys!
 2 years ago
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