x is minus or plus the root of b squared minus 4ac divided by 2a

x=((-11-+root(11^2+4*2*40))/2*2

x=((-11_+root(121+320))/4

x=((_11-+root(441))/4

x=(-11-+21)/4

x=10/4 or x =-32/4

x=2.5 0r -8

Apr 16th, 2015

The above of values of x satisfies the inquality

Apr 16th, 2015

The value of x I have obtained using quadratic equation and both answers satisfies the inequality if you take the value of x to be 2.5 or -8 you will get the same answer