Subject :IMO Class : Class 8
What must be subtracted from x4 + 2x2 - 3x + 7 to get x3 + x2 + x - 1?
Ax4 - x3 + x2 - 4x + 8
Bx3 + x2 - 4x + 8
Cx4 - x3 + x2 + 4x - 8
Dx4 - x3 - x2 + 4x - 8