1.

(x+1)(x+2)(x+3)(x+6)-3x^2​

Answer»

ANSWER:

WAY to do it is to WRITE (x+2)(x+3)=x2+6x+6−x, (x+1)(x+6)=x2+6x+6+x, so

(x+2)(x+3)(x+1)(x+6)=(x2+6x+6)2−x2

which GIVES that

(x+2)(x+3)(x+1)(x+6)−3x2=(x2+6x


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