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2. x^2+4x-21=0 akarnya (x - 3) (x + 7)
akar yang sama (x-3) jadi nilai x = 3
(x - 3)(x - 1) = 0
x1=3 x2=1
jadi, akar-akarnya x=3 atau x=1
x^2 + 4x - 21 = 0
(x + 7)(x - 3) = 0
x1=-7 x2=3
jadi akar-akarnya x=-7 atau x=3