1.

Expand using suitable identity (4a+2b-c)^2​

Answer»

an EXPAND this USING the IDENTITY -

{(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2ab + 2bc + 2ca

Comparing the given EXPRESSION with the above identity we get -

{(4a + 2b + ( - c))}^{2} = ( {4a)}^{2} + ( {2b)}^{2} + { (- c)}^{2} + 2(4a)(2b) + 2(2b)( - c) + 2( - c)(4a)

After simplifying we get-

= 16 {a}^{2} + 4 {b}^{2} + {c}^{2} + 16ab - 2bc - 8ca

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