book Maths Puzzle Numerical Ability

Find the value or values of x in the quadratic equation x^2=6x-9.

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The meteorologists at the National Interagency Fire Center had pizza delivered to their operations center. Their lunch consisted of pizza, milk and gelatin. One sli
How do I express in simplest radical form.

6 square root of 7 * 3 square of root 5

Do I first need to get a common number?

30 square root of 35 * 21 square root of 35