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Function f is defined by the equationf(x)=5x−9. Find the value of c so that f(c)=21 is true.

Function f is defined by the equationf(x)=5x−9. Find the value of c so that f(c)=21 is true.
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Function f is defined by the equationf(x)=5x−9. Find the value of c so that f(c)=21 is true.

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User Petehallw
by
8.7k points

1 Answer

4 votes

Answer:

c=6

Explanation:

f(x)=5x-9

c=x

f(x)=f(c)=21

5x-9=21

5x=21+9

5x=30

x=6

c=6

answered
User Jayanga Kaushalya
by
8.5k points
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