Question

Simplify: 2x(x + 18) - x(4x - 2)
>> -2x2 + 38x
-2x2 + 38
-2x2 + 34
I think its the first one, BUT isn't the first one and the second they same(yes i put them on here right)

Answer 1

2x(x+18) = 2x^2 + 36x
-x(4x-2) = -4x^2 + 2x

2x^2 - 4x^2 = -2x^2
36x + 2x = 38x.
-2x^2 + 38x

I also agree with the first one.

Answer 2

I would distribute then factor. BUt it could 2 much steps

Answer 3

2x(x + 18) - x(4x - 2)
2x(x + 18) -2x(2x - 1)
2x(x + 18 - (2x - 1))
2x(x + 18 - 2x + 1)
2x(x - 2x + 18 + 1)
2x(-x + 19)
-2x^2 + 38x