exam Maths Puzzle Numerical Ability

Solve by using quadratic formula:
x^2+4x+2=0

This is what I have, not sure if correct?
x=-4+-square root 4^2-4(1)(2) divided by 2

x=-4+-square root 2 divided by 2

x=2 x=-4

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exam Other Question

The width of a rectangle is 7 ft. less than the length. The area of the rectangle is 120 ft 2(square). Find the width of the rectangle. solve e^(2x-1) = 3.