(9x-3)^3
please solve this equation
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Answered by
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Step-by-step explanation:
follow the identity a^3-b^3-3ab(a-b)
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Answer:
(9x-3)^3
Step-by-step explanation:
(a-b)^3= a^3 -b^3-3ab(a-b)
(9x-3)^3=(9x)^3 - (3)^3 -3×(9x) ×(3) (9x -3)
=729x^3 -27 -81x (9x -3)
= 729x^3 -27 - 729x^2 - 243x
= (729x^3 -729x^2 -243 x) -27
=243x (3x^2- 3x -1) -27
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