1.

(7m-3n-4k)²

Answer»

(7m-3n-4k)(7m-3n-4k) using below formula (a+b+c)(a+b+c) = a*a+b*b+c*c+2ab+2bc+2ca

= 49m*m+9n*n+16k*k-42mn+24nk-56mk

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