please 4 question ke answer de do class 9.please full explain. photo send karna hai.
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Ans:- a(a - 1) - b(b - 1)
=> a² - a - b² + b
=> a² - b² - a + b
=> (a)² - (b)² - a + b
=> (a + b)(a - b) - (a - b)
=> (a - b)(a+b - 1)
2. = 9x² - 16y²
=> (3x)² - (4y)²
=> (3x - 4y)(3x + 4y)
3. = x² + 9x + 18
=> x² + 3x + 6x + 18
=> x(x + 3) + 6(x + 3)
=> (x + 3)(x + 6)
4. => (997)²
=> (1000 - 3)²
=> (1000)² - 2(1000)(3) + (3)²
=> 1000000 - 6000 + 9
=> 1000009 - 6000
=> 994009
here is your answer
hope it will help you
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