Question

a) 12 (x²-6x+5)-6(x-5)(x-3)

b) (x²+2x+4) (x³+8)

Answer 1

a) 12(x²-6x+5)-6(x-5)(x-3) = 12(x²-6x+5)-6(x²-8x+15) =
    =12x²-72x+60-6x²+48x-90 = 6x²-24x-30

b) (x²+2x+4)(x³+8) = x⁵+8x²+2x⁴+16x+4x³+32 =  x⁵+2x⁴+4x³+8x²+16x+32