Question

The function f(x) = 2x2 + 3x + 5, when evaluated, gives a value of 19. What is the function’s input value?The function f(x) = 2x2 + 3x + 5, when evaluated, gives a value of 19. What is the function’s input value?

Answer 1

-7/2 and 2

Explanation:

First we move the 19 to the left side

2x^2 + 3x + 5 = 19 becomes 2x^2 + 3x - 14 = 0

Now we can factor this into (2x+7)(x-2) = 0

input values are -7/2 and 2