Question

Subtract the sum of $4m^2$ + 3n- l and $5m^2$-11n -6l from the sum of $4m^2$ + 3n + l and $5m^2$-11n + 6l.

• A. $18m^2$ + 14l
• B. 14l
• C. -14l
• D. $-18m^2$ - 14l

Answer 1

The correct option is B 14l

Adding the like terms,
$4m^2$ + 3n- l + $5m^2$-11n -6l
= $9m^2$ -8n -7l (i)

$4m^2$ + 3n + l + $5m^2$-11n + 6l
= $9m^2$ -8n+7l (ii)

Subtacting (i) from (ii), we get,
$9m^2$ -8n+7l - ( $9m^2$ -8n -7l)
= 14l