tentukan himpunan penyelesaian persamaan 3pangkat 2 +7x -20=0

3x² + 7x -20 = 0
x¹'² = (-7±√49+240)/(2×3)
= (-7±√289)/6= (-7±17)/6
x¹ = (-7+17)/6 = 10/6 = 5/3
x² = (-7-17)/6 = -24/6 = -4

HP = {-4 , 5/3 }