(5x-1)(3x+2)(9x-4) simply
2 answers:
Answer:
135x^3 + 3x^2 - 46x + 8.
Step-by-step explanation:
(5x-1)(3x+2)(9x-4)
= (5x - 1)(27x^2 + 18x - 12x - 8)
= (5x - 1)(27x^2 + 6x - 8)
= 5x(27x^2 + 6x - 8) - 1(27x^2 + 6x - 8)
= 135x^3 + 30x^2 - 40x - 27x^2 - 6x + 8
= 135x^3 + 3x^2 - 46x + 8.
Step-by-step explanation:
= ( 5x - 1 ) ( 3x + 2 ) ( 9x - 4 )
= 5x ( 3x + 2 ) - 1 ( 3x + 2 ) ( 9x - 4 )
= 15x² + 10x - 3x - 2 ( 9x - 4 )
= ( 15x² + 7x - 2 ) ( 9x - 4 )
= 15x² ( 9x - 4 ) + 7x ( 9x - 4 ) - 2 ( 9x - 4 )
= 135x³ - 60x² + 63x² - 28x - 18x + 8
= 135x³ + 3x² - 46x + 8
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