Question

1. Simplify (7m-8n) ² + (7m+8n) ². Write the identities also​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

(a-b)^2 = a^2+b^2-2ab

(7m)^2+(8n)^2-(2×7m×8n)

49m^2+64n^2-112mn

(a+b)^2 = a^2+b^2+2ab

(7m)^2+(8n)^2+(2×7m×8n)

49m^2+64n^2+112

(7m-8n) ² + (7m+8n) ²

inserting the values and grouping the like terms

49m^2+49m^2+64n^2+64n^2-112+112

-112 and +112 get cancel due to different sings

98m^2+128n^2

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