Question

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

A 1.
B -1.
C 2.
D -2.
E -3

Answer 1

the answer is 2

Explanation:

Answer 2

2 x² + 3 x + 5 = 19
2 x² + 3 x - 14 = 0
x 1/2 = (-3 +/- √ (9 + 112 ) )/4 = (-3+/-11)/4
x 1 = 2
x 2 = -7/2
Answer: C ) 2