Question

Z' = 3xyz.
4. Without actually calculating the cubes, find the value of each of the following:
(i) (-12) + (7)3 + (5)3
(ii) (28) +(-15) +(-13)3
Give​

Answer 1

Step-by-step explanation:

1*(-12)+(7)3+(5)3

=(-12)+343+125

=(-12)+468

=456ans

2*(28)+(-15)+(-13)3

=(28)-5-2197

=(28)-2202

= -2174

Answer 2

Answer:

(i) ( − 12)3 + (7)3 + (5)3 = ( − 12 + 7 + 5) + 3( − 12)(7)(5) = 0 + 1260 = 1260

(ii) (28)3 + ( − 15)3 + ( − 13)3 = (28 − 15 − 13) + 3(28)( − 15)( − 13) = 0 + 16380 = 16380