Question

 

Answer 1

a)(\(\dfrac{-2}{3}\)x²y²z)(3xy²z²)

=(\(\dfrac{-2}{3}\)x3)(x².x)(y².y²)(z.z²)=-2x³y⁴z³

b)(3x³y²-5x²y+12xy):3xy

=x²y-\(\dfrac{5}{3}\)x+4

c)x(y+2z-yz)+z(xy-2x)

=xy+2xz-xyz+xyz-2xz

=xy

d)(4x-1)(4x+1)-(4x-1)²

=(4x-1)(4x+1)-2(4x-1)

=4x(4x+1)-1(4x+1)-8x+2

=16x²+4x-4x-1-8x+2

=16x²-8x+1