Question

OR
Find all the zeroes of the polynomial x + 3x2 - 4x - 12, if one of its zeroes is -3.​

Answer 1

Answer:

$x + 3x(2 - 4x - 12) \\ 2x - 4x {}^{2} - 12x + 6x - 36x \\ \\ 4x {}^{2} - 10x + 6x - 36 \\ 4x {}^{2} - 4x - 36 \\ 4x {}^{2} - 30 \\ 4x {}^{2} = 30 \\ x {}^{2} = 30 - 4 = 26 \\ x = 26 {}^{2} = x = 668$