exam Maths Puzzle Numerical Ability

May I have some help evaluating this expression?

Evaluate the expression and write the result in the form a + bi.

sqrt(1/5) sqrt(-125

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exam Other Question

can someone help me to express this into simplest form?

2/5-y/y-2
Thanks for your continued help.
Can you Solve the following 2 equation:
x^2e^x-5xe^x=0

5^3x=5^4x-2