a) If a + b = 9 and ab = 18; find: 1) a - b 2) ए स्क्वायर माइनस बी स्क्वायर
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Answer:
(a+b)²=a²+b²+2ab
9²=a²+b²+2×18
81-36=a²+b²
a²+b²=45
(a-b)²=a²+b²-2ab
45-2×18=45-36=9
a-b=3
a²-b²=(a+b)(a-b)
9×3=27
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