book Maths Puzzle Numerical Ability

find two numbers whose sum is 50and whose product is a maximum

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book Other Question

Please help me solve this equation:

(5a^3/12b^4)^-2



Thank you for your help!
please help me with this:


For a value of K, the expression x+k/x^2+kx-15 is undefined when x=5 and x=-3. Find the value of K