Question

what is the value of the expression below when y = 9?
$y^{2}+10y - 8$
answer attempt 1 out of 2

Explanation:

Step1: Substitute y = 9

Substitute \(y = 9\) into \(y^{2}+10y - 8\), we get \(9^{2}+10\times9 - 8\).

Step2: Calculate \(9^{2}\)

\(9^{2}=9\times9 = 81\), so the expression becomes \(81+10\times9 - 8\).

Step3: Calculate \(10\times9\)

\(10\times9 = 90\), then the expression is \(81 + 90-8\).

Step4: Calculate sum and difference

\(81+90=171\), and \(171-8 = 163\).

Answer:

163