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13 September, 08:13

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

+3
Answers (1)
  1. 13 September, 08:16
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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
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