Evaluate the sum of 4a²b + 5ab - 8b² + 7 and 6a²b - 11ab + 4b² - 9 for a = 1 and b = 2
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Answer:
-10
Step-by-step explanation:
4a²b + 5ab - 8b² + 7 ;(a= 1 , b=2)
= 4(1)²(2) + 5(1)(2) - 8(2)² +7
= 8 + 10 - 32 + 7
= 25 - 32 = - 7
6a²b - 11ab + 4b² - 9
6(1)²(2) - 11(1)(2) + 4(2)² - 9
= 12 - 22 + 16 - 9
= 28 - 31 = - 3
Their sum = -10
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