Question

without actually calculating the cubes find the value of the following 1). (-12)³+(7)³+(5)³. 2). (28)³+(-15)³+(-13)³ ​

Answer 1

Answer:

(-12)³ +(7)³+(5)³

 Let x = -12, y = 7 & z = 5

 x + y + z

=

-12 + 7 + 5 = 0

Here,

x+y+z=0

 We

know that if,

x +

y + z = 0,

 then x³ + y³ + z³ = 3xyz

(-12)³

+ (7)³ + (5)³ = 3(-12)(7)(5) = -1260

Answer 2

Answer:

this is the first answer for the question