Factoriser
A=(x+5)[ (-7x-6)+(8x-9)]
A= (x+5)(x-15)
B=(x+1)[ (5(5-2x)+5(8x-5)]
B= (x+1)(25-10x+40x-25)
B= 30x (x+1)
C= (x+1)[ 6(3x-2)-2(2-5x)]
C= (x+1)(18x-12-4+10x)
C= (x+1)(28x-16)
D= 16(x-1)(x-1)-8(x-1)(x+5)
D= (x-1) [16(x-1)-8(x+5)]
D= (x-1)(16x-16-8x-40)
D= (x-1)(8x-56)
D= 8(x-1)(x-7)