solve (a+b)^3 - 8(a-b)^3
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Step 1 :
Equation at the end of step 1 :
((a + b)3) - 8 • (a - b)3
Step 2 :
2.1 Evaluate : (a+b)3 = a3+3a2b+3ab2+b3 2.2 Evaluate : (a-b)3 = a3-3a2b+3ab2-b3
Checking for a perfect cube :
2.3 -7a3+27a2b-21ab2+9b3 is not a perfect cube
Final result:
-7a3 + 27a2b - 21ab2 + 9b3
Hope it helps u friend..
Equation at the end of step 1 :
((a + b)3) - 8 • (a - b)3
Step 2 :
2.1 Evaluate : (a+b)3 = a3+3a2b+3ab2+b3 2.2 Evaluate : (a-b)3 = a3-3a2b+3ab2-b3
Checking for a perfect cube :
2.3 -7a3+27a2b-21ab2+9b3 is not a perfect cube
Final result:
-7a3 + 27a2b - 21ab2 + 9b3
Hope it helps u friend..
Gargihazra:
now you tell me what will be the right answer
(-a+3b)(7a^2-6ab+3b^2)
it is a right answer
oh...thanks for knowing right answer
bt my answer is followed by book and internet
by which book
Math book
which writer
u can see internet also...
it is the question of R D sharma
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