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

asked Jan 19, 2017 46.2k views

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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

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7 votes

Answer:

the answer is 2

Explanation:

Tkr answered Jan 20, 2017

by Tkr

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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

Tarzen Chugh answered Jan 24, 2017

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