(5x+4)^2= 25x^2+40x+16
(2x-5)*2= (a-b)^2= 4x^2-20x+25
B= (x+5)^2-(3x-2)(x+5)
B= x^2+10x+25-[3x^2+15x-2x-10)
B= x^2+10x+25-3x^2-15x+2x+10
B= x^2-3x^2+10x-15x+2x+25+10
B= -2x^2-3x+35
Factoriser
4x^2-25= (a-b)(a+b)
(2x-5)(2x+5)
Factoriser D= (3x-1)^2+(3x-1)(2x-3)
(3x-1)[(3x-1)+(2x-3)]
(3x-1)(3x-1+2x-3)
(3x-1)(5x-4)
Factoriser E
(2x-1)^2-(x+3)^2
(2x-1)-(x+3)[(2x-1)+(x+3)]
