Question

(X^2+8X-6)(X^2+8X+3)-36

Answer 1

(X^2+8X-6)(X^2+8X+3)-36

=[(X^2+8X)^2]-6(X^2+8X)+3(X^2+8X)-18-36

=(X^4+16X^3+64X^2)-3(X^2+8X)-54

=X^4+16X^3+61X^2-24X-54