Question

(7m+3n)-(7m-3n) please tell this answer​

Answer 1

Answer:

14m+6n

Step-by-step explanation:

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Answer 2

Answer:

9n

Step-by-step explanation:

$(7m + 3n) - (7m - 3n)$

Remove unnecessary parentheses.

$= > 7m + 3n - (7m - 6n)$

When there is a - in front of an expression in parentheses, change the sign of each term in the expression.

$= > 7m + 3n - 7m + 6n$

Since two opposites add upto zero, remove them from the expression

$= > 3n + 6n$

Collect like terms

$= > 9n$