please can someone tell me if i am doing these right and are these 2 correct? find the product
1. problem is: (x-5)(x^2+5x+25)
my answer is: x^3-125

2. problem: (4X+4Y)^2
my answer is: 16x^2+32xy-16y^2

Question

please can someone tell me if i am doing these right and are these 2 correct? find the product
1. problem is: (x-5)(x^2+5x+25)
my answer is: x^3-125

2. problem: (4X+4Y)^2
my answer is: 16x^2+32xy-16y^2

anonymous · Answer

16x^2+32xy+16y^2 

The first one is right.

mertsj · Answer

The last one should be +16Y^2

anonymous · Answer

where did i go wrong on the second one?

anonymous · Answer

$$
(a+b)^2 = a^2 + 2 a b + b^2
$$

anonymous · Answer

you are right thank you i see how it comes to be i appreciate your help