Question

$(7m - 8n)2 + (7m + 8n)2$
please tell me answer​

Answer 1

Answer:

Step-by-step explanation:

(7m - 8n )² + ( 7m + 8n )²

= (7m)² - 2 (7m) (8n) + ( 8n )² + (7m )² + 2 (7m ) ( 8n ) + ( 8n )²

= 49m² - 112mn + 64 n² + 49m² + 112mn + 64n²

= 98m² + 128n² is the answer.

Answer 2

Answer:

$(7m - 8n)^2 + (7m + 8n)^ 2 =98m^2 + 128n^2$

Step-by-step explanation:

$(7m - 8n)^2 + (7m + 8n)^ 2\\ =(7m)^2 - 2 (7m)(8n) + (8n)^2 + (7m)^2 + 2 (7m)(8n) + (8n)^2 \\= 49m^2 - 112m n + 64n^2 + 49m^2 + 112mn + 64n^2 \\= 49m^2+ 49m^2 - 112mn+ 112mn + 64n^2 + 64n^2\\=98m^2 + 128n^2$