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The cubic function p is defined by

p(x)=x(x+1)(x+2)+(x+1)(x+2)(x+3)

Solve the equation

p(x)=0

and hence sketch the curve

y=p(x)

Don't expand the brackets: focus on factorising out the common factors.


x(x+1)(x+2)+(x+1)(x+2)(x+3)=(x+1)(x+2)[x+(x+3)]