Question

Each side y of a square is increased by 5 units.Which expression represents the number of square units in the area of the new square?

Answer 1

We have a square with side y

we are told that ewach side is increase by 5 units

then the new side is

y+5

now, the area pf the square is a^2

thus

$A=(y+5)^2$

Given the following formula

$(a+b)^2=(a^2+2ab+b^2)$

Reaplicing for our values

where

a=y

b=5

$A=y^2+2*(y)*(5)+5^2$

$A=y2+10y+25$

answer is B