Multiple the following: 1.) (-3x)(3x)2.) (4x)²3.) x (x+4)4.) (x+2)²5.) (x+3)(x-4)6.) x² (x²+2x-4)

1) (-3x)(3x)

= -9x^2

2) (4x)^2 = 4^2 x^2

= 16x^2

3) x(x+4) = x•x+4x

= x^2+4x

4) (x+2)^2 = x^2+2x•2+2^2

= x^2+4x+4

5) (x+3)(x-4) = x^2-4x+3x-12

= x^2-x-12

6) x^2(x^2+2x-4) = x^2•x^2•x^2•2x-4x^2

= x^4+2x^3-4x^2

She will need 5/8 bags for each square yard.