exam Maths Puzzle Numerical Ability

How do I use the quadratic formula to solve: 1.4x^2-2x-10=0

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exam Other Question

determine the pair of lines is paralle, perpendicular or neither:
3x-8y+-10
32+12y=19 How do you tell wethere a triangle is a right triangle or not and how to give a reason.. for example here is a problem:

x=25 y=25 z=38