benellix77 benellix77

17-11-2016
Mathematics

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If f(x)=x^2 - 3 and f(a)=46, what is the value of a? explain

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MatCauthon MatCauthon

17-11-2016

You are trying to find what x to put into f(x) to get out 46. To do this, solve the following equation.
[tex] x^{2} -3 = 46[/tex]
[tex]x^2 = 49[/tex]
[tex]x^2 = \sqrt{49} [/tex]
Therefore x = 7 or x = -7

-7, 7

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