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Question
If p = −2, q = −1 and r = 3, find the value of 2p2 − q2 + 3r2
Solution
\[2 \times ( - 2 )^2 - ( - 1 )^2 + 3 \times (3 )^2 = 2 \times ( - 2 \times - 2) - ( - 1 \times - 1) + 3 \times (3 \times 3)\]
\[ \Rightarrow 8 - 1 + 27 = 34\]
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