solve x^2=2x=15 by completing the square
a. 3,-5
b. 6,-2
c. 5, -15
d. 4, -15

Question

solve x^2=2x=15 by completing the square
a. 3,-5
b. 6,-2
c. 5, -15
d. 4, -15

kewlgeek555 · Answer

Okay, so if you are a fast math problem solver, try to plug the values in. I'll dot he first one for you:$$x ^{2}=2x=15$$$$3^{2}=2\times-5=15$$$$9=2\times-5=15$$Since you already see that one of them is 9, then you know that a is not the answer.  Try the other ones.

anonymous · Answer

so i plug in one of them to the equation?! @kewlgeek555

kewlgeek555 · Answer

Yes.  You plug in B, just like I

kewlgeek555 · Answer

did with A.

anonymous · Answer

on the beginning part why is x^2 =2x=15 <<< where that from

kewlgeek555 · Answer

The directions say that the two first equations have to equal 15, so when you plug in the values, they have to be 15 = 15 = 15.

kewlgeek555 · Answer

Here - let me help you do B:
$$x ^{2}=2x=15$$$$6^{2}=2\times-2=15$$$$36=2\times-2=15?$$FALSE.  The answer is NOT B or A.

kewlgeek555 · Answer

Try to do C by yourself.

anonymous · Answer

omg!! lol its supposed to be x^2+2x=15!! my bad