exam Maths Puzzle Numerical Ability

18. solve for x log5 5x=2

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exam Other Question

For the quadratic equation f(x) 5.64x^2-3.135x-5.79
What is the Minimum Value? What is the x an y intercepts? What is the Y?

For the quadractic equation f(x) 5.79x^2-3.135x- I just can't seem to grasp the real, rational, irrational, and integer numbers. Any advice for what might be getting in the way of me knowing this stuff?