a^3-27 factorise
25 points
Answers
Answered by
1
Answer:
a^3 - 27 = a^3 - 3^3
a^3 – b^3 = (a – b) (a^2 + ab + b^2 ) [ this equation was from the web ]
= [a-3] [a^2 + 3a + 3^2]
= [a-3] [ a^2 + 3a + 9]
-------------------------------------------------------------------------------------------------------------
Hope this helps.
Answered by
0
Answer:
Then this is a sum of cubes and we can apply the sum of cubes formula: a 3 + b 3 = (a + b) (a 2 − a b + b 2 ). Substituting a = x and b = 3 into the formula yields: x 3 + 27 = (x + 3) (x 2 − 3 x + 9).
Step-by-step explanation:
Similar questions