Question

PLEASE HELP

Question 5 of 10

f(x) = 4.2? + 52 - 3
g(x) = 4.23 – 3.2 + 5
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Find (f +g)(x).
O A. (f +g)(x) = -4x + 7x² + 5x – 8
O B. (f +9)(z) = 4x + x2 + 5x + 2
O c. (f +9)(x) = 8x + 2x + 2
OD. (f+g)(x) = 4.c.3 + 4x2 + 2x + 2

Answer 1

Explanation:

arithmetic operations in functions are simple : you take both expressions and apply the arithmetic operation on them.

in our case : addition.

f(x) = 4x² + 5x - 3

g(x) = 4x³ - 3x² + 5

(f+g)(x) = (4x² + 5x - 3) + (4x³ - 3x² + 5) =

= 4x² + 5x - 3 + 4x³ - 3x² + 5 =

= 4x³ + x² + 5x + 2

so, B should be the right answer (despite all the typos there).