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Estimating Sum or Difference

Subtract -8...

Question

Subtract $- 8 x y$ from $7$ $x y$

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Solution

Let $a = 7 x y$ and $b = - 8 x y$

According to the question,

$a - b = 7 x y - (- 8 x y)$

$a - b = 7 x y + 8 x y$

$a - b = 15 x y$

Hence, this is the answer.

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