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Find the following using appropriate algebraic identity: i) (a+5b)2 ii) (2m – 3n)2 iii) (7x+y)(7x–y) iv) (x+6y)(x–4y) |
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Answer» )²a² + (5b)² + 2*a*5ba² + 25b² + 10abIdentity USED : (x+y)² = x² + y² + 2xy(2m - 3N)²2m² + (3n)² - 2*2m*3n4m² + 9n² - 12mnIdentity used : (x-y)² = x² + y² - 2xy(7X + y)(7x - y)(7x)² - y²49x² - y²Identity used : (a+b)(a-b) = a² - b²(x+6Y)(x–4Y)x(x - 4y) + 6y(x - 4y)x² - 4xy + 6xy - 24y²x² + 4xy - 24y² |
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