Question

Subtract -2x² from the sum of 4x² and 15x².​

Answer 1

`21x^(2)`

Explanation:

`4x^(2) +15x^(2) --2x^(2)`

`4x^(2) +15x^(2) +2x^(2)`...........2 negatives signs next to each make a positive

`21x^(2)`.................................combine like terms

Answer 2

Explanation:

(4x²+15x²)-(-2x²)=19x²+2x²=21x²