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4x² - 12x + 9 = 0
D = b² - 4ac
= 144 - 4(4)(9)
= 144 - 144
= 0
soal 2
Persamaan kuadrat baru:
x² - (3 - 5)x + 3(-5) = 0
x² + 2x - 15 = 0
4x² - 12x = -9
4x² - 12x + 9 = 0
a = 4 ; b = -12 ; c = 9
Diskriminan = b² - 4ac
= (-12)² -4(4)(9)
= 0 karena Diskriminan=0 maka hanya mempunyai 1 penyelesaian
x1,2 = (-b + √Diskriminan)/2a
= (12 + 0)/2(4)
= 12/8
= 1,5
penyelesaian = 1,5
2)
x² - (x1+x2)x + x1x2 = 0
x² - (3 - 5)x + (3)(-5) = 0
x² + 2x - 15 = 0