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f ' (x) = 3(x^2 + 5x)^2 ( 2x + 5)
f '(x) = 3(2x+5)(x^2 + 5x)^2
.
f ' (x) = (6x+15)(x⁴ + 10x³ + 25x²)
f ' (x) = 6x⁵ + 60x⁴ + 150x² + 15x⁴ +150x³ + 375x²
f ' (x) = 6x⁵ + 75x⁴ + 150 x³ + 525 x²