x=-1 x3 + 4x2 + kx - 5
-1] 1 4 k -5
+ a c e
*1 b d f *bring down
steps:
a= -1(value of x) multiply it by *1 (-1x1) => -1 -1] 1 4 k -5
b= 4 plus a (4+-1) => 3 + -1 -3 5
c= -1(value of x) multiply it by b (-1x3) => -3 1 3 -5 0
f= 0 since the equation has no remainder => 0
e= f or 0 minus -5 (0+5) => 5
d= e divided by -1(value of x) (5/-1) =>-5
k= d minus c (-5-(-3))=>-5+3 ==>-2