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ICSE Class 9 Answered

1. Without actually calculating the cubes find the value of :  1.  (27)^3 +  (-17)^3 + (-10)^3  2. (-28)^3 +(15)^3 + (13)^3
Asked by aadrica.kanika | 11 Nov, 2018, 05:52: PM
answered-by-expert Expert Answer
273 + (-17)3 + (-10)3 
Consider,
x = 27, y = -17, z = -10
x + y + z = 0
Hence,
x3 + y3 + z3 = 3xyz
273 + (-17)3 + (-10)3 = 3 × 27 × (-17) × (-10) = 13770 
Answered by Sneha shidid | 12 Nov, 2018, 12:46: PM

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