On expansion we get, (7m 3n 4k)^2 #160; (7m)^2+( 3n)^2+( 4k)^2+2.(7m)( 3n)+2.( 3n)( 4k)+2.(7m)( 4k) 49m^2+9n^2+16k^2 42n+24nk 56k ...

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Linear Equation in 2 Variables

Expand : 7m-...

Question

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$(7 m - 3 n - 4 k)^{2}$

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Solution

On expansion we get,

$(7 m - 3 n - 4 k)^{2}$

$⟹ (7 m)^{2} + (- 3 n)^{2} + (- 4 k)^{2} + 2. (7 m) (- 3 n) + 2. (- 3 n) (- 4 k) + 2. (7 m) (- 4 k)$

$⟹ 49 m^{2} + 9 n^{2} + 16 k^{2} - 42 n + 24 n k - 56 k$

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