x^4-3=2x+1
how can i solve it ? thanks in advance
That formula only works on quadratic equations and the equation in the original post is a quartic (x^4)
Did you mean $\displaystyle x^2-3 = 2x+1$ or $\displaystyle x^4-3 = 2x+1$
Given $\displaystyle ax^2+bx+c=0$ then the quadratic formula is $\displaystyle x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$