Question 1049800

If {{{f(x)=x^2-3}}} and {{{f(a)=46}}}, the value of {{{a}}}is: 

 {{{46=x^2-3}}}......solve for {{{x}}}

 {{{46+3=x^2}}}

{{{49=x^2}}}

{{{x=sqrt(49)}}}

{{{x=7}}} or {{{x=-7}}}=>{{{a=7}}} or {{{a=-7}}}