please help me urgent urgent please.if you know answer send me if you don't know leave please
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Step-by-step explanation:
1) x³ - x² - x + 1
=> x² ( x - 1) - 1(x - 1(
=> (x - 1) (x² - 1)
=> (x - 1) ( x + 1) (x - 1)
5) 67 × 73
=> (70 - 3)(70 + 3) [ (a+b)(a-b) = a² - b² ]
=> 70² - 3²
=> 4900 - 9
=> 4891
6) (2x - 5y) (2x + 5y) [ same identity as above ]
=> (2x)² - (5y)²
=> 4x² - 25y²
8) [ x/2 + y/3 + z/4 ]²
=> (x/2)² + (y/3)² + (z/4)² + 2*x/2*y/3 + 2*y/3*z/4 +
2*z/4*x/2
=> x²/4 + y²/9 + z²/16 + xy/3 + yz/6 + zx/4
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