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Solve the following equations:
$(a).\ 2(x+4)=12$
$(b).\ 3(n-5)=21$
$(c).\ 3(n-5)=-21$
$(d).\ -4(2+x)=8$
$(e).\ 4(2-x)=8$
To do:
We have to solve the given equations.
Solution:
(a) $2(x+4)=12$
$\Rightarrow 2x+8=12$
$\Rightarrow 2x=12-8$
$\Rightarrow 2x=4$
$\Rightarrow x=\frac{4}{2}$
$\Rightarrow x=2$
(b) $3(n-5)=21$
$3n-15=21$
$\Rightarrow 3n=21+15$
$\Rightarrow 3n=36$
$\Rightarrow n=\frac{36}{3}$
$\Rightarrow n=12$
(c) $3(n-5)=-21$
$\Rightarrow 3n-15=-21$
$\Rightarrow 3n=-21+15$
$\Rightarrow 3n=-6$
$\Rightarrow n=\frac{-6}{3}$
$\Rightarrow n=-2$
(d) $-4(2+x)=8$
$\Rightarrow -8-4x=8$
$\Rightarrow -4x=8+8$
$\Rightarrow -4x=16$
$\Rightarrow x=\frac{-16}{4}$
$\Rightarrow x=-4$
(e) $4(2-x)=8$
$\Rightarrow 8-4x=8$
$\Rightarrow -4x=8-8$
$\Rightarrow -4x=0$
$\Rightarrow x=0$
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