Answer
$x^4+5x^3+x^2-11x+4$.
Work Step by Step
The given expression is
$=(x^2+2x-1)(x^2+3x-4)$
Multiply the right side trinomial by each term of the left side trinomial.
$=x^2(x^2+3x-4)+2x(x^2+3x-4)-1(x^2+3x-4)$
Clear the parentheses.
$=x^4+3x^3-4x^2+2x^3+6x^2-8x-x^2-3x+4$
Add like terms.
$=x^4+5x^3+x^2-11x+4$.
