(a+b+2c)² -(a-b+c)²
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Answer:
) (a + b)² = a² + 2 ab + b²
(2) (a + b)² = (a - b)² + 4 ab
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(3) (a - b)² = a² - 2 ab + b²
(4) (a - b)² = (a + b)² - 4 ab
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(5) a² - b² = (a + b) (a - b)
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(6) (x+a) (x+b) =x² + (a + b) x+a b
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(7) (a+b)³=a³+3a²b+3ab²+b³
(8) (a+b)³=a³+b³+3ab(a+b)
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(9) (a-b)³=a³-3a²b+3ab²-b³
(10) (a-b)³=a³-b³-3ab(a-b)
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(11) a³+b³ = (a+b)(a²-ab+b²)
(12) a³+b³=(a+b)³-3 ab(a + b)
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(13) a³-b³= (a-b)(a²+ab+ b²)
(14) a³-b³=(a-b)³ +3ab(a-b)
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(15) (a+b+c)²= a²+b²+c² +2ab+2bc+2ca
(16) (a+b-c)²=a²+b²+c² +2ab-2bc-2ca
(17) (a-b+c)²= a²+b²+c²-2ab-2bc+2ca
(18) (a-b-c)²= a²+b²+c²-2ab+2bc-2ca
(19) a² + b² = (a + b)² - 2ab
(20) a² + b² = (a - b)² + 2ab
(21) a² + b²=½ [(a+b)²-(a-b)²]
(22) ab = ¼[(a+b)²- (a - b)²]
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