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Ankit added $3 x^{2}$ and $4 x^{2}$ and wrote $7 x^{4}$ . What went wrong?

Class 8Adding and Subtracting ExpressionsAlgebra

AHe should have multiplied 3 and 4
BNothing, $7 x^{4}$ is correct
CThe answer should be $12 x^{2}$
DHe added the powers; it should be $7 x^{2}$

Step-by-Step Solution

When adding like terms, only the coefficients are added:

3 x^{2} + 4 x^{2} = 7 x^{2}

. The power of

x

stays 2.

Answer: D) He added the powers; it should be

7 x^{2}

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