exam Maths Puzzle Numerical Ability

I have a problem solving this problem Can someone help me?
The problem is solve using the sqrt property:
2x^2-35=15

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exam Other Question

A bag contains 6 red marbles, 9 blue marbles, and 5 green marbles. You withdraw one marble, replace it, and then withdraw another marble. What is the probability that you do NOT pick two green marble? Sketch the graph of this equation
x=9