# Unknown Value of "x" in Quadratic Equation 2x2 + 9x + 10 = 0 -2 & -2.5 are the roots of quadratic equation 2x2 + 9x + 10 = 0. Users may replace the input values of this equation 2x2 + 9x + 10 = 0 to verify the similar calculations or generate complete work with steps to find what is the unknown or root value of x.

## Work with Steps for 2x2 + 9x + 10 = 0

The below work with steps may helpful for grade school students to understand how to find unknown or root values of x for quadratic equation 2x2 + 9x + 10 = 0 or to solve the worksheet problems. step 1 Address the input parameters and values
Quadratic Equation : 2x2 + 9x + 10 = 0

step 2 Substitute a , b and c values in below formula

x = - b ± b² - 4ac2a

=-(9) ± (92 - 4 (2) (10))2(2)

=-9±81 - 4 (2)(10)4

=-9±81 - 804

=-9±14

step 3 Solve the above expression for minus & plus values
x1 = -9 + 14

= -9 + 1/4

x2 = -9 - 14

= -9 - 1/4

step 4 By simplifying the above expressions for x1 & x2
x1 = -8/4
x1 = -2
x2 = -10/4
x2 = -2.5

x1 = -2 & x2 = -2.5 are the roots for equation 2x2 + 9x + 10 = 0 