Verify $a-( -b)=a+b$ for $a=21,\ b=18$.
Given: $a=21,\ b=18$.
To do: To verify $a-( -b)=a+b$ for $a=21,\ b=18$
Solution:
$L.H.S.=a-( -b)$
$=21-( -18)$ [on substituting values $a=21,\ b=18$]
$=21+18$
$=39$
$R.H.S.=a+b$
$=21+18$
$=39$
Thus, $L.H.S.=R.H.S.$
Hence verified $a-( -b)=a+b$.
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