exam Maths Puzzle Numerical Ability

Find all the numbers for which the rational expression is undefined.

7/x^2+81 (7 over x squared + 81)

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exam Other Question

In this question I need to use the �discriminant� to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. I need help please!!

1. 4/3x2 - 2x + 3/4 = 0 How do I write 116 2/3% as a fraction or mixed number.