Question

Solve the quadratic
8x^2 - 5x - 4 = 0
Thanks!

Answer 1

x= -0.461

x= 1.086

Explanation:

using the quadratic formula

A=8, B=-5, C=-4

The evaluate

`x=\frac{-(-5) +\sqrt{(-5)x^(2) -4*8*(-4)} }{2*8} and x=\frac{-(-5) -\sqrt{(-5)x^(2) -4*8*(-4)} }{2*8}`

calculate

`x=(5+√(25+128) )/(16) } and x=(5-√(25+128) )/(16) }`
Simplify

`x=(5+3√(17) )/(16) and x=(5-3√(17) )/(16)`

simply

x= -0.461 and x= 1.086