The expression if factorized completely to give (3h + 7)(h - 6)
From the information given, we have that the expression is;
3h² - 11h - 42
Now, find the product of the coefficient of h² and the constant value that sums up to give - 11, then, we have;
3h² -18h + 7h - 42
Now, group the expression in pairs, we have;
(3h²- 18h) + (7h - 42)
factor out the common terms, we have;
3h(h - 6) + 7(h - 6)
Now, we get that;
(3h + 7)(h - 6)