if P = -2 Q = - 1 are = 3 find the value of 2p2 - q2+3r2
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2p2-q2+3r2
2(-2)2-(-1)2+3×3×2
-4×2+1×2+18
-8+2+18
-8+20
12
2(-2)2-(-1)2+3×3×2
-4×2+1×2+18
-8+2+18
-8+20
12
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