Question

If $f\left(x\right)=2x^4-x^2$, what is the value of $f\left(2\sqrt{3}\right)$?

• A. $43\sqrt{3}$
• B. $12$
• C. $276$
• D. $24\sqrt{3}$

Answer 1

Answer: (C)

$276$

$f\left(x\right)=2{\left(2\right)}^4{\left(\sqrt{3}\right)}^4-{\left(2\right)}^2{\left(\sqrt{3}\right)}^2=(2\times 16\times 9)-(4\times 3)$

$=288-12=276$