Question

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

Answer 1

Step-by-step explanation:

7m+7m-8n+8n+2+2

7+7=14

-8+8=0

2+2=4

14+4

14m+4

Answer 2

Answer:

Given, (7m - 8n )² + (7m + 8n)²

we know , (a - b)² = a² - 2ab + b²

and ( a + b )² = a² + 2ab + b²

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then,

(7m - 8n)² + (7m + 8n)²

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

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

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

= 98m² + 128n²