Question

5x² = 2x + 18, then x =​

Answer 1

Answer:

(1±$\sqrt{91}$)÷5

Step-by-step explanation:

   5x² = 2x + 18

⇒5x²-2x-18 = 0

⇒x = {-(-2)±$\sqrt{(-2)^2-4*5*(-18)}$} ÷ (2×5)

⇒x = (2±$\sqrt{364}$) ÷ (2×5)

⇒x = (2±2$\sqrt{91}$) ÷ (2×5)

∴ x = (1±$\sqrt{91}$)÷5