Math, asked by prerna2018, 1 year ago

(-a-b) ² =??????????

Answers

Answered by kunaljj
1

Answer:


Step-by-step explanation:


Attachments:
Answered by abhi569
2

Answer:

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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