Question

Without actually calculating the cubes, find the value of each of the followin
(1) (-12)+(7) + (5)3
(ii) (28) + (-15)3 +(-13)3
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Answer 1

Answer :

1. -1260
2. 16380

Explanation:

• 1:  (−12)3+(7)3+(5)3
• Here, −12+7+5=0,
• So, (−12)3+(7)3+(5)3=3(−12)(7)(5) = −1260

• 2: (28)3+(−15)3+(−13)3  
• Here, 28+(−15)+(−13)=0,
• So, (28)3+(−15)3+(−13)3=3(28)(−15)(−13)
• 84∗195 = 16380

I Hope this helps you

Answer 2

Answer:

(1) (-12)+(7) + (5)3 = 120

(ii) (28) + (-15)3 +(-13)3 = -5544

Step-by-step explanation:

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