SOLUTION: solve the polynomial inequality and graph the solution set on a number line. express the solution set in interval notation. 5x^2-3x is greater than or equal to 8

Question 156337: solve the polynomial inequality and graph the solution set on a number line. express the solution set in interval notation.
5x^2-3x is greater than or equal to 8
Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
5x^2-3x is greater than or equal to 8
first we find roots of 5x^2-3x-8=0
=

roots are -1 and 1.6
5x^2-3x is greater than or equal to 8 when
5x^2-3x-8 is greater than or equal to 0
sign of 5x^2-3x-8 is +++++++0- - - - - -0+++++++++
-1 1.6
(press show source to see the sign better)
then Solution set is: (-inf,-1]U[1.6,inf)
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