4. Simplify the following expression and
find its value, when x = -1 and y = 2.
2x2 - 3y + 3x2 + 5y2 + 5x - 7 - 7x + 2y.
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Step-by-step explanation:
2x
2
−3y+3x
2
+5x
2
+5x−7−7x+2y
=10x
2
−2x−y−7
At x=−1 and y=2,
10(−1)
2
−2(−1)−2−7
= 10+2−2−7
=3
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