exam Maths Puzzle Numerical Ability

Find all real and imaginary solution to the equation.
b^4+13b^2+36=0

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exam Other Question

Please help me Solve this equation logx^24 + (logx^9) + 3 = 3log4 May someone help me translate into an algebraic expression. Thanks

"Twice the difference of a number and one added to triple the number yields twenty less than six times the number."