using the quadratic formula solve the equation 9x2+7x-2=0

Comparing the above quadratic equation with ax2 + bx + c = 0, we get 

a = 9  ;  b = 7  ;  c = -2

D = b2 - 4ac = (7)2 - 4 (9) (-2) = 49 + 72 = 121 > 0

So the given equation has real and distinct roots which are given by :

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