Answer:
Step-by-step explanation:
a = co-efficient of x² = 3
b = co-efficient of x = 7
c = constant = -20
Determinant = D = b² -4ac
= 7² - 4*3*(-20)
= 49 + 240
= 289
[tex]x =\dfrac{-b + \sqrt{D}}{2a} ; \ x =\dfrac{-b- \sqrt{D}}{2a}\\\\\\x=\dfrac{-7+\sqrt{289}}{2*3} ; \ x=\dfrac{-3-\sqrt{289}}{2*30}\\\\\\x=\dfrac{-7+17}{6} ; \ x=\dfrac{-7-17}{6}\\\\x=\dfrac{10}{6}; \ x=\dfrac{-24}{6}\\[/tex]
x = 5/3 ; x = -4
