exam Maths Puzzle Numerical Ability

Solve for x algebraically: 5^(2x)- 4(5)^x=-3

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exam Other Question

Please help me solve this equation.

y^2=-8y
I need help please I am not sure but I believe the answer -6/0 which I believe is undefined. Am I right? Thanks so much for your help.
Perform the indicated operation.


14-20
_________

(4)(3)-12