Question 10: If \(g(x)=7x-2\) and \(s(x)=8x^2-3\) find:
\((v)\) \(\;\) \(s(-9) \)
Solution:
\(s(x)=8x^2-3\)
\(s(-9)=8(-9)^2-3\)
\(\ \ \ \ \ \ \ \ \ \ =8\times 81-3\)
\(\ \ \ \ \ \ \ \ \ \ =648-3\)
\(\ \ \ \ \ \ \ \ \ \ =645\)
Question 10: If \(g(x)=7x-2\) and \(s(x)=8x^2-3\) find:
\((v)\) \(\;\) \(s(-9) \)
Solution:
\(s(x)=8x^2-3\)
\(s(-9)=8(-9)^2-3\)
\(\ \ \ \ \ \ \ \ \ \ =8\times 81-3\)
\(\ \ \ \ \ \ \ \ \ \ =648-3\)
\(\ \ \ \ \ \ \ \ \ \ =645\)