Question

( 7m −3n) ² + 84mn = ( 7m + 3n) ²​

Answer 1

the answer is given in the photo . I hope that it would be correst

Answer 2

Answer:

Heya your answer

(7m+3n)²

Step-by-step explanation:

(7m-3n)²+84mn

49m²+9n²-42mn-84mn

49m²+9n²+42mn

(7m)²+(3n)²+(2)(7m) (3n)

=(7m+3n)²

therefore (7m-3n)²+84mn=(7m+3n)²

Hope it's will help u

$answer \: by \: eric \: taeyong$