book Maths Puzzle Numerical Ability

what is the discriminant in the quadratic equation x2 + 11x + 121 = x + 96

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book Other Question

Find an equation of the line (in either general form or slope intercept form) that contains the centers of the following two circles:

x^2+y^2-4x+6y+4 = 0 and x^2+y^2+6x+4y+9 = 0 What is the formula for the area of a trapezoid?