exam Maths Puzzle Numerical Ability

I need hel with the following question:

SOLVE FOR X:

e^(x^2)=e^(3x)* (1/e^2)

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exam Other Question

Evaluate without a calculator
1. sec(210 degrees)

2. tan(-pi/4)
Muliply This

m^2+8m+15/a+b*7a+14b/m+3