Practicing Success
If $27x^3 - 64y^3 = (Ax + By)(Cx^2+Dy^2-Exy)$, then value of (A - B + C - D + E) will be : |
-12 18 15 -20 |
-12 |
Given, 27x3 – 64y3 = (Ax + By)(Cx2 + Dy2 – Exy) a3 – b3 = (a – b)(a2 + b2 + ab) ⇒ (3x)3 – (4y)3 = (3x – 4y)(9x2 + 16y2 – 12xy) So, Comparing the values we get, A = 3, B = -4, C = 9, D = 16 and E = -12 The value of (A – B + C – D + E) = [3 – (-4) + 9 – 16 + (-12)] = (3 + 4 + 9 – 16 – 12) = (16 – 16 – 12) = -12 |