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2x³ . 7x⁴ . (3x)² = 2x³ . 7x⁴ . 9x²
= (2 . 7 . 9)x³⁺⁴⁺²
= 126 x⁹
= 2x^3 . 7x^4 . 9x^2
= 126 x^(3+4+2)
= 126 x^9
b. -2p/q . (-q)^4 . 2/5 p^2
= -2p/q . q^4 . 2/5p^2
= -4/5 . p^(1-2) . q^(4-1)
= -4/5 p^(-1) . q^3
= -4/5 q^3 / p