X^2-8x-9=0 x1 dan x2 (3x1 dan 3x2)
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Pertanyaan
X^2-8x-9=0 x1 dan x2 (3x1 dan 3x2)
1 Jawaban
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1. Jawaban jarvisezarp5f127
A= 1 . B= -8 . C=-9
X1+X2 = -b/a X1.X2=c/a
= -(-8)/1 =-9/1
=8 =-9
X1+X2 X1.X2
=3x1 + 3x2 =3x1 . 3x2
=3(x1 + x2) =9x1.x2
=3. 8 =9(x1 . x2)
=21 =9. -9
= -81
X^2 - (x1+x2)x + (x1.x2)
X^2 - 21x + (-81)
X^2 - 21x - 81