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If f(x)=x^2-15 and f(a)=49, what is the value of a? Explain.

If f(x)=x^2-15 and f(a)=49, what is the value of a? Explain.
asked 1.8k views
5 votes
If f(x)=x^2-15 and f(a)=49, what is the value of a? Explain.

asked
User Taras Leskiv
by
8.3k points

1 Answer

2 votes

Answer:

a=8, -8

Explanation:

a^2-15=49

a^2=49+15

a^2=64

a=sqrt(64)

a=8, -8

answered
User Trent Davies
by
8.0k points
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