Question

6. If a = -2,6 =-3 and c = 5 and then find the value of : (i) a3 + b3 + c3 - 3abc (ii) 2a + 5b - 4c + a2 + 62-c2 ​

Answer 1

Step-by-step explanation:

Given :- a = -2

b = - 3

C = 5

i] a 3 + b 3 + C3 - 3 abc

( - 2) x 3 + (-3) x 3 + 5 x3 - 3 (- 2 ) ( - 3)(5)

- 6 + ( - 9) +15-3 x 25

- 6 +(- 9) +15 - 75

= - 75

ii] 2 a + 5 b - 4 c+a 2+ b 2- c 2

2 x (-2) +5 x (-3) - 4 x 5 + (-2) x 2+ (-3) x2 - 5x2

- 4 +(-15)-20+ (-4) + (-6) - 10

= - 59