Find the discriminant for each equation and, hence, decide if the equation has two distinct roots, two

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Find the discriminant for each equation and, hence, decide if the equation has two distinct roots, two equal roots or no real roots.
a. x2 − 12x + 36 = 0   

b. x2 + 5x − 36 = 0 

c. x2 + 9x + 2 = 0

d. 4x2 − 4x +1 = 0

e. 2x2 −7x + 8 = 0

f. 3x2 + 10x − 2 = 0

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