If a = 3, b = 0, c = 2 and d =1, find the value of a square + 2b square - 3c square
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a=3,b=0,c=2
a²+2b²-3c²
(3)²+2×(0)²-3×(2)²
9-12 = -3
a²+2b²-3c²
(3)²+2×(0)²-3×(2)²
9-12 = -3
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