exam Maths Puzzle Numerical Ability

Solve using the quadratic formula: z^2 - 3z = 40

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Hello,

Can someone please help me with this math problem I don't really understand it at all. I have been trying very hard to understand it so can you please help me. If you can The logarithm of a product is equal to the sum of the logarithms and the logarithm of a sum or a difference usually does not simplify. Can someone please help me I have a problem b