Question

Is this trinomial factorable r^2-15r+56

Answer 1

(r - 8)(r - 7)

Explanation:

Consider the factors of the constant term (56) which sum to give the coefficient of the r- term (- 15)

The factors are - 8 and - 7, hence

r² - 15r + 56 = (r - 8)(r - 7) ← in factored form