Question

please tell me the answer

Answer 1

Answer:

${(m + n)}^{2} + {(m - n)}^{2} \\ = {m}^{2} + {n}^{2} + 2mn + {m}^{2} + {n}^{2} - 2mn \\ = 2 {m}^{2} + 2 {n}^{2} \\ = 2( {m}^{2} + {n}^{2} )$

Answer 2

Answer:

Here's your answer

(m+n)*2 +(m-2)*2

m*2 +n*2+2mn+(m*2+4 -2*m*2)

m*2 +n*2 +2mn +m*2 +4 -4m

2m*2 +n*2 +2mn +4 -4m

2m(m+n+2)+n*2 +4 ........