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Verified answer
1. (-4p³q²r)³= (-4)³ p³×³ q²×³ r³
= -64 p^9 q^6 r³
2. (5p⁴q²r³)⁴
= 5⁴ p⁴×⁴ q²×⁴ r³×⁴
= 625 p^16 q^8 r^12
3.(5×-7)²
= (5×-7)(5×-7)
= 25x² - 35x - 35x + 49
= 25x² - 70x + 49
4.(4m+1/m)²
= 16m² + 8m + 1 / m²