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

$(t-5)(4t^2+3)$
Using factoring by grouping, the factored form of the given expression, $4t^3-20t^2+3t-15 ,$ is \begin{array}{l} (4t^3-20t^2)+(3t-15) \\\\= 4t^2(t-5)+3(t-5) \\\\= (t-5)(4t^2+3) .\end{array}