Given f(x) = 2x + 9, if f(x) = 15, find x.

Mathematics

1 answer:

AleksandrR [38]3 years ago

4 0

Answer:

Step-by-step explanation:

$f(x)=2x+9\\\\\text{Substitute}\ f(x)=15:\\\\15=2x+9\qquad\text{subtract 9 from both isdes}\\\\15-9=2x+9-9\\\\6=2x\qquad\text{divide both sides by 2}\\\\\dfrac{6}{2}=\dfrac{2x}{2}\\\\3=x\to x=3$

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Given f(x) = 2x + 9, if f(x) = 15, find x.​

Given f(x) = 2x + 9, if f(x) = 15, find x.