7. Factor the polynomial by grouping. 8st+2t-20s-5 8st+2t-20s-5= (Fa

To factor the polynomial by grouping, we can group the terms in pairs and factor out the common factors from each pair. Grouping the terms in pairs: Factoring out the common factors from each pair: Now, we can factor out the common binomial factor : Therefore, the factored form of the polynomial is .