exam Maths Puzzle Numerical Ability

ln(x)-ln(x-2)=ln(7)

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exam Other Question

How do you find if an equation has 2 real number solutions, 1 real solution or no real-number solutuons? an example is x^2-6x+c=0 What value of y is associated with the following values of x (a)x=2 (b)x=3 (c)x=-2