Question
Simplify: $5\left\{ a ^2- a ( a -\overline{ a -2})\right\}$
✓
Answer
$5\left\{a^2-a(a-\overline{a-2})\right\}$
$=5\left\{a^2-a(a-a+2)\right\}$
$=5\left\{a^2-a^2+a^2-2 a\right\}$
$=5 a^2-5 a^2+5 a^2-10 a$
$=5 a^2-10 a$
$=5\left\{a^2-a(a-a+2)\right\}$
$=5\left\{a^2-a^2+a^2-2 a\right\}$
$=5 a^2-5 a^2+5 a^2-10 a$
$=5 a^2-10 a$
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