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Plz....... answer this question guys...

Answer»

AX + by + c = 0

bx + CY + a = 0

cx + ay + b = 0

Adding all the above equations, we get,

ax + by + c + bx + cy + a + cx + ay + b = 0

ax + ay + a + bx + by + b + cx + cy + c = 0

a(x + y + 1) + b(x + y + 1) + c(x + y + 1) = 0

(x + y + 1)(a + b + c) = 0

Assuming, (a + b + c) = 0, we get,

a + b = -c ... (1)

Cubing both SIDES,

a^3 + b^3 + 3ab(a + b) = -c^3

a^3 + b^3 + 3ab(-c) = -c^3 ... from eq. (1)

a^3 + b^3 - 3abc = -c^3

a^3 + b^3 + c^3 = 3abc


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