Explanation:
Q1. 2x³-5x³= -3x³
Q2. 3x⁴-2x⁴+7x⁴= x⁴+7x⁴
= 8x⁴
Q3. (2x³)(5x³) = 10x⁹
Q4. (2x³y²)(5x³yz²) = 10x⁹y²z³
Q5. (12x³)(4x) = 48x⁴
Q6. (18x³y²z⁵)(6x³yz²) = 108x⁹y²z¹⁰
Q7. (2x³y²)³ = 8x⁹y⁶
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