Question

What is x? 3x^2 - 26x +56=0

Answer 1

x = 4 or 14/3

Explanation:

Let's use quadratic equation:

x =
`(b (+/-)√(b^2 - 4ac) )/(2a)`

(the (+/-) stands for ±)

Plug in values

x = 26±
`(√((-26)^2 - 4(3)(56)) )/(2(3))`

x = 26±√676 - 672/6

x = 26±√4/6

x = 26±2/6

x = 24/6 or 28/6

x = 4, 14/3

Double check in the equation:

x = 4 is correct and x = 14/3