(-a-b) ² =??????????
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Step-by-step explanation:
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Value of ( - a - b )^2 is a^2 + b^2 + 2ab
Step-by-step explanation:
Method 1 : -
⇒ ( - a - b )^2
⇒ [ - 1 ( a + b ) ]^2
⇒ ( - 1 )^2 x ( a + b )^2
We know that the value of ( a + b )^2 is a^2 + b^2 + 2ab.
⇒ ( - 1 x - 1 )( a^2 + b^2 + 2ab )
⇒ 1( a^2 + b^2 + 2ab )
⇒ a^2 + b^2 + 2ab
Method 2 : -
⇒ ( - a - b )^2
⇒ ( - a - b )( - a - b )
⇒ [ -1( a + b ) ] [ - 1( a + b ) ]
⇒ ( - 1 x - 1 )[ ( a + b )( a + b ) ]
⇒ 1( a + b )( a + b )
⇒ ( a + b )( a + b )
⇒ a( a + b ) + b( a + b )
⇒ a^2 + ab + ab + b^2
⇒ a^2 + 2ab + b^2
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