Hi I really need help s with this question please

3x^4 y - 48x^2 y =

3x^2 y ( x^2 - 16 ) =

3x^2 y ( x - 4 )( x + 4 )

-45x²y

so basically you subtract the numbers and then the indices

edit: just realised this was the wrong method x

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

9x