Question

(x^2+11x+24)(x^2+14x+24)-4x^2

Answer 1

原式=(x^2+11x+24)(x^2+10x+24)+4x(x^2+11x+24)-4x^2

=(x+3)(x+8)(x+4)(x+6)+4x(x^2+10x+24)

=(x+3)(x+8)(x+4)(x+6)+4x(x+4)(x+6)

=(x+4)(x+6)(x^2+15x+24)