Question

Simplify: 5x – 12y + 8x + 2x2 + 4x2

13x2 – 12y + 6x4

13x – 12y + 6x2

-3x – 12y + 6x2

7x2y

Answer 1

Terms that have the same variables and the same exponents can be combined together.

5x - 12y + 8x + 2x^2 + 4x^2 =

= 5x + 8x - 12y + 2x^2 + 4x^2

= 13x - 12y + 6x^2

Answer: Second choice, 13x - 12y + 6x^2

Answer 2

5x - 12y + 8x + 2x² + 4x²

Combine like terms

You can keep the variables/exponents the same if you are adding or subtracting the same like terms (same variable to the same power)

5x - 12y + 8x + 2x² + 4x²

We can combine 5x + 8x and 2x² + 4x² because they are like terms; -12y will be left alone

13x - 12y + 6x² is your answer