Question

Factorise X^2+Y^2+X+Y+2XY and (x^2-3x)(x^2-3x-1)-20.

Answer 1

Step-by-step explanation:

x²+y²+x+y+2xy

=(x²+2xy+y²) +x+y

=(x+y)²+(x+y)

=(x+y)(x+y+1)