Question

14. Without actually calculating the cubes, find the value of each of the following:
(i) (-12) + (7) +(5)?
(i) (28)3 + (-15)3 +(-13)3
Ionath and breadth of each of the following​

Answer 1

Answer:

i) -1260

i) -1260ii) 16380

Step-by-step explanation:

we have a formula for this-

${a}^{3} + {b}^{3} + {c}^{3} = 3abc$

(i) a = (-12) , b = (7) , c = (5)

(i) a = (-12) , b = (7) , c = (5)now just put these values in 3abc from formula

(i) a = (-12) , b = (7) , c = (5)now just put these values in 3abc from formula3 x -12 x 7 x 5 = -1260

try the (ii) yourself