Question

HELP, struggling and not understanding. Please and thank you! ツ

What are the factored forms of the following expressions?:

1.) d^2+18d+81
-(d+9)(d-9)
-(d+9)^2
-(d-81)(d-1)
-(d-9)^2

2.) d^2-22d+121
-(d+11)^2
-(d-11)^2
-(d-11)(d+11)
-(d-121)(d-1)

3.) r^2-49
-(r-7)(r+7)
-(r+7)(r+7)
-(r-7)(r-7)
-(r-7)(r+9)

4.) k^2-81h^2
-(k-9h^2)(k+9)
-(k+9h)(k+9h)
-h^2(k+9)(k-9)
-(k+9h)(k-9h)

5.) 25x^2+40x+16
-(5x+4)^2
-(5x-4)^2
-(5x+4)(5x-4)
-(25x+4)(x+4)

Answer 1

Even if it's just helping me on one problem so I understand a little more. That would be greatly appreciated! :)