please solve question no 9
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=> 36(a+b)² - 49(a-b)²
(a+b)² = a²+2ab+b²
(a-b)² = a²-2ab+b²
=> 36(a²+2ab+b²)-49(a²-2ab+b²)
= 36a²+72ab+36b²-49a²+98ab-49b²
= -13a²+170ab-13b²
(a+b)² = a²+2ab+b²
(a-b)² = a²-2ab+b²
=> 36(a²+2ab+b²)-49(a²-2ab+b²)
= 36a²+72ab+36b²-49a²+98ab-49b²
= -13a²+170ab-13b²
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