Question

Add the following

$5x^2{y}^2,7x^2{y}^2,3x^2{y}^2$

Answer 1

Addition of like terms

When all the terms have the same sign, then add the numerical coefficients and prefix the common sign.

Here all the terms have the same sign and the variable is $x^2{y}^2$

$$\begin{gathered} =5x^2{y}^2+7x^2{y}^2+3x^2{y}^2 \\ =(5+7+3)x^2{y}^2 \\ =15x^2{y}^2 \end{gathered}$$