2. 3x - x ^ 2 - 5 = - 8
3. x - 2x + 5x ^ 2 = 12
4. 9x ^ 2 - x + 5x ^ 2 - 4 = 5
5. 4x ^ 2 - 9x = 9x + 7
tolong jawabkan soal nomor mtk diatas tentang persamaan kuadrat
3. x - 2x + 5x ^ 2 = 12
4. 9x ^ 2 - x + 5x ^ 2 - 4 = 5
5. 4x ^ 2 - 9x = 9x + 7
tolong jawabkan soal nomor mtk diatas tentang persamaan kuadrat
−x²+3x−5+8 =0
− x²+3x+3 = 0
x²−3x−3 = 0
diskriminan D= b²−4 a c
D= (-3)²−4×1×−3
D = 9+12 = 21
x= ( −b± √D)/( 2a )
x= ( −(-3) ± √21 )/(2×1)
x= (3 +√21)/2 atau
x=( 3−√21 )/2