Question 967295


Calculate the discriminant of the quadratic equation 


{{{2x^2+7x-9}}} = {{{0}}}.


It is  d = {{{b^2 -4ac}}} = {{{7^2 - 4*2*(-9)}}} = {{{49 + 4*2*9}}} =  . . . 


You even do not need to calculate the exact value to answer the question:  it is clear that the discriminant is a positive number.


Hence,  the given quadratic equation has two real roots.