Question

If the side of a square is increased by $8cm$, its area increased by $120c{m}^2$ .The side of the square is

• A. $3.5cm$
• B. $5.5cm$
• C. $2.5cm$
• D. $4.5cm$

Answer 1

The correct option is A $3.5cm$

${(x+8)}^2=x^2+120$
$\Rightarrow 16x=56\Rightarrow x=3.5cm$