. Find the value of:
(a) 8x + 2y – 3xy +½x²
for x = -3, y = 5
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8x + 2y - 3xy + ½ x²
________
Substituting the given values,
= 8(-3) + 2(5) - 3(-3) (5) + ½ (-3)²
= (-24) + (10) + (45) + (9/2)
Taking LCM = 2 for the whole expression,
= [ (-48) + 20 + 90 + 9 ] / 2
= 71/2
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