book Maths Puzzle Numerical Ability

Find the LCM of (100, 14, 20)

Give the principle please

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book Other Question

what is the name of the solution of the quadratic equation x squared- x-1=0? I am having trouble with these two problems. I can get half way but then I am confused on how to solve them. If someone can help I will greatly appreciate it. Thanks

x^2-4x=1