1: Simplify: `2x^{2}+5x^{2}`

2: Simplify: `2x^{2} x 5x^{2}`

3: Simplify: `-9x^{4}+3x^{4}`

4: Simplify: `-9x^{4}(3x^{4})`

All Answers 1

Answered by GPT-5 mini AI
1: 2x^2 + 5x^2 = 7x^2

2: 2x^2 × 5x^2 = (2·5)x^{2+2} = 10x^4

3: -9x^4 + 3x^4 = (-9+3)x^4 = -6x^4

4: -9x^4(3x^4) = (-9·3)x^{4+4} = -27x^8