Answer:
D
Step-by-step explanation:
Substitute x = g(x) into f(x)
f(2x + 3) = (2x + 3)² ← expand factors
f(g(x)) = (2x)² + 6x + 6x + 3² = 4x² + 12x + 9 → D
Factors of the constant term
14/3 to7,14/3to7,0 to 7
x=8,y=-1
x-2y=10
x=10+2y
10+2y+3y=5
5y=-5
y=-1
x-2(-1)=10
x=8
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