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anonymous
 3 years ago
2x^2+4x=16
x=?
anonymous
 3 years ago
2x^2+4x=16 x=?

This Question is Closed

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2Rearrange it to become 2x^2+4x  16 = 0 Then plug it into the formula or factor it

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2You can factor out a 2, see where that gets you..

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2it becomes 2(x^2 + 2x  8) = 0 when you factor it

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2Can you factor x^2 + 2x  8 ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0it would be (x+4)(x2) right?

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2Do you know the formula? The quadratic formula?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Yes and no, I forgot the steps

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2Nice you factored it right

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0So then I would plug the x+4 and x2 into the equation right,? it would be 2(4)^2+4(2)=16??

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2So 2(x^2 + 2x  8) = 0 2 (x  2 ) ( x + 4 ) = 0 NOW, you know how anything times zero = 0? You have to make at least one of the brackets = 0 to get zero as an overall answer. So what can we put as x to make the brackets zero? There is x in two places so there are 2 answers

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2To find the answers, factoring is one way. The formula is another. Yo chose to factor so you dont need to use the formula anymore

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.2You just have to make the brackets = 0, don't put in the two! See we got 2 (x  2 ) ( x + 4 ) = 0 So, one bracket is (x2) . We want to make this = 0 x2 = 0 x = 2 !!! One of the answers.. Next bracket (x+4) Make it equal to zero. x+4 = 0 x= 4 So the answer is x = 4 or x = 2

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0oh wow, that was really simple, Now I under stand
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