how to factorise 27 -125a cube-135a+225a square
Divyankasc:
27 - 125a³ - 135a + 225a
= (3)³ + (-5a)³ + (3×3×3×-5a) + (3×3×-5a×-5a)
That is in the form of (a-b)³ = a³ - b³ -3a²b + 3ab²
225a square is correct
So, the answer is (3-5a)³
and there will be minus in ur 2nd step before 3x3x3x-5a...right :)
I have written minus
ok ok..i got u :)
Answers
Answered by
288
27 - 125a³ -135a+ 225a²
=(3)³ - (5a)³ -3×3×5a(3 - 5a)
=(3-5a)³
=(3)³ - (5a)³ -3×3×5a(3 - 5a)
=(3-5a)³
both methods are correct ur mothed id come from mine
sry method
there in a square and b square aretake and put in bracket
Answered by
117
Answer:
27-125a³-135a+225a
= (3-5a)³
= (3-5a)(3-5a)(3-5a)
Step-by-step explanation:
Given 27-125a³-135a+225a
=3³+(-5a)³+3×3²×(-5a)+3×3×(-5a)²
= [3+(-5a)]³
/* By an algebraic identity:
*/
=(3-5a)³
Therefore,
27-125a³-135a+225a = (3-5a)³
•••♪
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