Question

If f(x)=7x^2+3x+5, what is f(3+h)

Answer 1

$f(3 + h) = 7(3 + h) ^{2} + 3(3 + h) + 5 = 7(9 + 6h + h ^{2} + 5 = 63 + 42h + 7h ^{2} + 9 + 3h + 5 = 7h ^{2} + 39h + 14 = 7h ^{2} + 39h = - 14$