Question

If f(x)= 5x^2+3x-1What would f(7a) equals to?

Answer 1

Solution

- The solution steps are given below:

$\begin{gathered} f(x)=5x^2+3x-1 \\ \\ put\text{ }x=7a \\ \\ f(7a)=5(7a)^2+3(7a)-1 \\ \\ f(7a)=5(49a^2)+21a-1 \\ \\ f(7a)=245a^2+21a-1 \end{gathered}$

Final Answer

The answer is

$f(7a)=245a^{2}+21a-1$