find the value of the expression, if a = 2, b=-2 , c=1. explain
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=2a^2 + 2b^2- 2c^2
=2(2)^2 + 2(-2)^2- 2(1)^2
=2×4 + 2×4 -2×1
=8+8-2
=16-2
=14
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