exam Maths Puzzle Numerical Ability

A=24e^.005(382)

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exam Other Question

Solve the equation:

sqrtx+4 = 3

I tried to keep this seperated because the square root is x + 4.

I am going to assume I need to make X equal the 3 leaving me with this:
X= -1
sqrt-1+4 = 3
Is this the right process? A triangle has sides 3x +7, 4x - 9, and 5x +6. Find the polynomial that represents its perimeter.