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Algebra

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Combine the Like Terms

ALGEBR-JNGK67

Combine the like terms of the following equation:

$$x^{2} + y^{2} + 3y^{2}$$

A

$3y^{4}x^{2}$

B

$x^{2} + 4y^{2} $

C

$4y^{4}x^{2}$

D

$x^{2} y^{2} + 3y^{2}$