Evaluate : $10 x^{2} + 8 a x - 10$ , given $x = 5$ and $a = - 2$ .

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Solution

$\begin{matrix} G i v e n e q u a t i o n 10 x^{2} + 8 a x - 10, x = 5 & a = - 2 n o w p u t x = 5 i n e q u a t i o n 10 x^{2} = 8 a x - 10 \Rightarrow 10 \times {(5)}^{2} = 8 a \times (5) - 10 \Rightarrow 250 + 40 a - 10 n o w a g a i n p u t a = - a i n e q u a t i o n 250 + 40 a - 10 \Rightarrow 250 + 40 (- 2) - 10 \Rightarrow 250 - 80 - 10 \Rightarrow 250 - 90 \Rightarrow 160 \end{matrix}$

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