Question

A-b=-8 and ab =-12 ,then a cube - b cube = ?

Answer 1

-224 is the correct answer

Answer 2

Answer:

Step-by-step explanation:

a - b = -8

a + 8 = b

(a + 8) * a = -12

a² + 8a + 12 = 0

∴ a = -6, -2

if a = -6,

then b = 2

if a = -2

then b = 6

∴if a = -6,

then a³ - b³ =  -216 + 8 = -208

if a = -2

then a³ - b³ = -8 + 216 = 208