exam Maths Puzzle Numerical Ability

-20 - (-1)
____________
-3 - (-3)
Help please, I believe this is Undefined but want to double check! Thanks so much for your help.

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exam Other Question

Find all real and imaginary solutions to the equation.

b^4+13b^2+36=0
2x^2+13x+6

2k^2-7k+6

2x^2+7x-4



(i need the answers to these questions)^