5. Simplify the following expressions and find the value when x = -2, y = 1. IV. -2(x2 - y2 + xy) – 3(x2 + y2
- xy)
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Answer:
-2 { -2^2 - 1^2 + (-2×1)} -3 { -2^2+ 1^2 - (-2×1)}
=-2 { 4-2 -2 } -3 { 4+2+2 }
= -2 × 0 -3 × 8
= 0-24
= -24 answer
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