Question 770760
(x + 1)(x^3 + 7x^2 + 5x + 4)
x^4 + 7x^3 + 5x^2 + 4x + x^3 + 7x^2 + 5x + 4
Collect like terms.
x^4 + 8x^3 + 12x^2 + 9x + 4
Hope this helps.
:-)