Question
Simplify the expression $2a – 2b – 4 – 5 + a$ and find their value if $a = –1, b = –2.$
✓
Answer
$=2a – 2b – 4 – 5 + a$
$= 2a – 2b – 4 – 5 + a$
$= 2a + a – 2b – 4 – 5 [$rearranging terms$]$
$= 3a – 2b –9$
$= 3(-1) – 2(-2)–9$
$= -3 + 4 - 9$
$= -12 + 4= -8$
$= 2a – 2b – 4 – 5 + a$
$= 2a + a – 2b – 4 – 5 [$rearranging terms$]$
$= 3a – 2b –9$
$= 3(-1) – 2(-2)–9$
$= -3 + 4 - 9$
$= -12 + 4= -8$
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