expand 2x(x-8)^2

Question

expand 2x(x-8)^2

shamil98 · Answer

$$\huge 2x(x-8)(x-8)$$

shamil98 · Answer

multiply (x-8)(x-8)
first
then multiply the product by 2x

anonymous · Answer

What would I do in this instance then? (x+2)(x+7)(x-2)

shamil98 · Answer

well it's the same thing you don't have to do in any specific order, you can multiply and add in any order and you'll get the same result

anonymous · Answer

Here's what I got... I don't think it's right at all.
$$x ^{3}+7x ^{2}-10x-42$$

anonymous · Answer

is that right?

hero · Answer

(x+2)(x+7)(x-2) = (x + 2)(x - 2)(x + 7)
                        = x^2 - 4(x + 7)
                        = x^2(x + 7) - 4(x + 7)
                        = x^3 + 7x^2 - 4x - 28

anonymous · Answer

oh ok!
Thank you very much!

hero · Answer

Keep in mind difference of squares

$(a + b)(a - b) = a^2 - b^2$


And distributive property:
$a(b + c) = ab + ac$