Multiply (x^6+8) (x+9)?

(x^6+8) (x+9) =
x^6*x + x^6*9 + 8*x + 8*9 =
x^7 +9x^6 + 8x + 72

x^7 + 9x^6 + 8x + 72

(x^6 + 8)(x + 9)
= x^6(x) + x^6(9) + 8(x) + 8(9)
= x^7 + 9x^6 + 8x + 72

(x^6 + 8) (x + 9) = x^7 + 8x + 9x^6 + 72 (See?)

x^7 + 9x^6 + 8x + 72

x^7+8x+9x^6+72