Choose two values, a and b, each between 8 and 15. Show how to use the identity a3 + b3 = (a + b)(a2 − ab + b2) to calculate the sum of the cubes of your numbers without using a calculator.

see explanation

Step-by-step explanation:

let a = 9 and b = 12 , then

9³ + 12³

= (9 + 12)(9² - 9(12) + 12²)

= 21(81 - 108 + 144)

= 21 × 117

= 2457

look a the sides they are perpendicular

  n=   0.0000 - 0.3750 i  

  n=   0.0000 + 0.3750 i

step-by-step explanation:

one of these should be correct