Find the roots of the quadratic equation: 2x^2+3x-9=0?.
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x= -b±√b^2-4ac/2a
x= -3±√9-4*2*-9/2*2
x=-3±√9+72/4
x= -3±√81/4
x=-3±9/4
x=-3-9/4 ; -3+9/4
x= -12/4 ; 6/4
x= -3 ; 3/2
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