Answer:
[tex]f(a^{2})=7(a^{4})-8[/tex]
Step-by-step explanation:
we have
[tex]f(x)=7x^{2}-8[/tex]
we know that
[tex]f(a^{2})[/tex]
Is the value of f(x) for [tex]x=a^{2}[/tex]
so
substitute the value of x in the function
[tex]f(a^{2})=7(a^{2})^{2}-8[/tex]
[tex]f(a^{2})=7(a^{4})-8[/tex]
