exam Maths Puzzle Numerical Ability

A circle whose center is at the point (1,2) passes through the point (4,-2). What is the length of the radius of the circle?

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exam Other Question

Use FOIL to multiply:
(6x – 1)(3x – 4)
Hi, Can I please have some help finding the real or complex solutions of the equation?

3x^2-4x+5=0