exam Maths Puzzle Numerical Ability

Find an equation of the circle of radius 4 that is tangent to both branches of the graph y=|x|

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exam Other Question

3) Study the method of linear interpolation presented in chapter 5. Given p(x) = 2x^3 – 3x^2 – 6x + 4, show that there is an irrational root in the interval (0,1) and use linear interpolation to find the root accurate to two decimal places. I am trying understand this one problem

x-y when x is twice y and x =12
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