book Maths Puzzle Numerical Ability

What is graph does quadratic function and the domain and range?

y = 16 - x^2

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book Other Question

solve: 1/e^-x^2=(e^3x)*1/e^2 I have this really hard question that I can't work out, and even though you might not find it hard...I DO! Anyways, here is the question

For what values of a are there exactly