If a + b = 9 & ab = 18, then the value of (a^2 – ab + b^2 ) is ……………
A. 29
B. 28
C. 27
D. 26
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Answered by
5
a+b = 9
ab = 18
a² + b² = (a+b)² - 2 ab
= 9² - 2 x 18
= 81 - 36
= 45
Again
a²+b²=(a-b)²+2 ab
⇒ 45 = (a-b)² + 2 x 18
⇒ (a-b)² = 45-36
⇒ (a-b)² = 9
∴ a-b = 3
Answered by
0
Answer:
answers is c. 27
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