exam Maths Puzzle Numerical Ability

How do i calculate the value of the discriminant of x^2+x+3=0

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Can you help me solve this: one angle is angle x, and another is the right angle (90�). Since the angles in a triangle add up to 180�, the other angle will be 90-x. For the unlabe an angle of x degree has property that its complement is equal to 1/6 of its supplement.