Explanation:
f(x) = 4x + 15
6x - 3
if x = -1 (replace x with -1 )
f(-1) = 4(-1) + 15
6(-1) -3
= -4 + 15
-6 -3
= -11
-9
"minus cancel each other when dividing"
Answer = 11
9 or 1.22
Hope this helps ...:-)
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