## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$(5x+4)(x^2-2)$
Using factoring by grouping, the factored form of the given expression, $5x^3+4x^2-10x-8 ,$ is \begin{array}{l} (5x^3+4x^2)-(10x+8) \\\\= x^2(5x+4)-2(5x+4) \\\\= (5x+4)(x^2-2) .\end{array}