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x³+x²-ax+8=0
(-2)³+(-2)²-(-2)a+8=0
-8+4+2a+8=0
2a+4=0
2a=-4
a=-2
x = -2
(x-2) adalah faktor f(x) maka f(-2) = 0
f(x) = x³ + x² - ax+ 8
f(-2) = 0 --> (-2)³ +(-2)² - a(-2) + 8 = 0
-8 + 4 + 2a +8 = 0
4 + 2a = 0
2a = - 4
a = - 2