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x = - 1 atau x = - 4
b) (x + 2)(x - 8) = 0
x = - 2 atau x = 8
c) pakai rumus abc
( x + 1)( x + 4 )
x = -1 √ x = -4
B) x^2 - 6x - 16 = 0
( x - 8 )( x + 2 )
x = 8 √ x = -2
C) x^2 - 2x - 5 = 0
a = 1 , b = -2 , c = -5
X1,2 = 2 + √4+20
2
= 2 + √24
2
= 2 + 2√6
2
= 1 + √6
X1 = 1+√6
X2 + 1-√6