Question

verify a- (-b)=a+b following values of a and b
$1) \: a = 21 \: b = 28 \:$
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Answer 1

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$a - ( - b) = a + b$

$21 - ( - 28) = 21 + + 28$

$21 + 28 = 21 + 28$

$49 = 49$

$lhs = rhs$

Hence verified