Question

Which of the following methods would be easiest to use to solve 2x^2 + 5x - 11 = 0

A) factoring
B) isolating the x^2 term and finding the square root of both sides
C) using quadratic formula
D) all three methods would be easy and effective

Answer 1

The easiest ways is to use the quadratic formula that is:

x' = [-b+√(b² - 4ac)]/2a and x" = [-b -√(b² - 4ac)]/2a

Solving : 2x² + 5x - 11 = 0, gives:

x' = [-5+√(25 - 4(2)(-11)]/4 and x" = [-5-√(25 - 4(2)(-11)]/4

x' = (-5+√113)/4 & x" = (-5-√113)/4