Question

Simplify
(9 m - 8n)sq+ (9 m+ 8n)²
please tell soloution​

Answer 1

Step-by-step explanation:

(9m+8n)^2= (9m)^2 + 2×9m×8n + (8n)^2

= 81m^2 + 144mn + 64n^2....... Equation 1

(9m-8n)^2 = (9m)^2 - 2×9m×8n + (8n)^2

= 81m^2 - 144mn + 64n^2......... Equation 2

Equation 2 + Equation 1

= 81m^2 - 144mn +64n^2 + 81m^2 + 144mn + 64n^2

+144mn and -144mn will get cut

= 81m^2 + 64n^2 + 81m^2 + 64n^2

= 162m^4 + 128n^4

Hope it helps :)