Question

Evaluate: $(2y+5)(2y+5)$

• A. $4y^2+10y+25$
• B. $4y^2+20y+25$
• C. $4y^2+20y+15$
• D. $y^2+20y+25$

Answer 1

The correct option is B

$4y^2+20y+25$

$(a+b{)}^2=a^2+2ab+b^2$
$(2y+5)(2y+5)$
$=(2y{)}^2+(2\left)\right(2y\left)\right(5)+5^2$
$=4y^2+20y+25$