Question

$y^2 + 3y^2$

Explanation:

Step1: Identify like terms

Both $y^2$ and $3y^2$ are like terms (same variable and exponent).

Step2: Combine coefficients

Add the coefficients of the like terms: $1 + 3 = 4$

Step3: Attach the common term

Multiply the sum by the common term $y^2$: $4 \times y^2 = 4y^2$

Answer:

$4y^2$