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x³+px²-x-2 = 0
(-1)³+p(-1)²-(-1)-2 = 0
-1+p+1-2 =0
p = 1-1+2
p= 2
jadi p(x) = x³+2x²-x-2
maka
x²-1
x³+2x²-x-2 dibagi x+2
x³+2x²
_________-
-x-2
-x-2
___-
0
jadi hasil baginya yaitu x²-1.
semoga berkah ^_^
P(x) = x^3 + px^2 - x - 2
P(-1) = (-1)^3 + p(-1)^2 - (-1) - 2 = 0
=> -1 + p + 1 - 2 = 0
=> p = 2
P(x) = x^3 + 2x^2 - x - 2 dibagi (x + 2) => x = -2
-2 | 1 .... 2 .... -1 .... -2
.... | ...... -2 .... 0 .... 2
---------------------------- +
...... 1 ..... 0 ..... -1 .| 0 => sisa
Hasil bagi 1x^2 + 0x - 1 = x^2 - 1