Given the function ƒ (x) = 20x2 - 18x - 25, find ƒ (-1). A) ƒ (-1) = 27 B) ƒ (-1) = 13 C) ƒ (-1) = - 13 D) ƒ (-1) = - 23

Question

Mathematics

Malakai Byrd

30 June, 00:11

Given the function ƒ (x) = 20x2 - 18x - 25, find ƒ (-1). A) ƒ (-1) = 27 B) ƒ (-1) = 13 C) ƒ (-1) = - 13 D) ƒ (-1) = - 23

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Sandra Atkins · Answer 1

B

Step-by-step explanation:

f (-1) means that x was substituted for (-1)

Thereforce, 20x^2 - 18x - 25 becomes 20 (-1) ^2 - 18 (-1) - 25

Negative numbers multiplied by another negative number become positive.

f (-1) = 20 + 18 - 25 = 13

f (-1) = 13