exam Maths Puzzle Numerical Ability

Find all real and imaginary solutions to the equation.

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

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exam Other Question

Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x. I will nee -20 - (-1)
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-3 - (-3)
Help please, I believe this is Undefined but want to double check! Thanks so much for your help.