Question

1. Multiply: (x + 4) (x + 4) (x - 4).​

Answer 1

Answer:

x^3+4x^2-16x-64

Step-by-step explanation:

= (x+4)(x+4)(x-4)

= (x+4)^2(x-4)

= x^2+2×X×4+16(x-4)

= x(x^2+8x+16)-4(x^2+8x+16)

= x^3+8x^2+16x-4x^2-32x-64

= x^3+4x^2-16x-64