Question

square both sides of the equation: x = 5 + 3y

Answer 1

\[(x)^2=(5+3y)^2\]
\[(x+y)^2=x^2+2xy+y^2\]
\[\therefore x^2=(5)^2+2(5)(3y)+(3y)^2\]
\[x^2=25+30y+9y^2\]