Question

without actually calculating the cubes and using suitable identities evaluate the expression 35³-20³-15³
step wise step solution best answer I will mark as brainlist ​

Answer 1

Answer:

Taking 35 = a , -20 = b , -15 = c

a + b + c = 35 - 20 - 15 = 0

If a+b+c = 0, Then a^3 + b^3 + c^3 = 3abc ------ Identity

35^3 + (-20)^3 + (-15)^3 = 3 x 35 x -20 x -15

                        = 31,500

Shortest and the easiest method to do this question...Please mark as Brainliest

Answer 2

Answer:

22500

Step-by-step explanation:

35³-20³-15³

a= 35 b= -20 c= -15

IDENTITY a³+b³c³ = 3abc

so

=3×35×-20×-15

= 31500 ans

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