exam Maths Puzzle Numerical Ability

Find the length of the latus rectum of the parabola with an equation
x^2-6x-8y+25

Work so far:

x^2-6x=8y-25
x^2-6x+9=8y-25
(x-3)^2=8y-25

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exam Other Question

Use the properties for radicals to simplify each of the following expressions. Assume that all variables represent positive real numbers.

1. square root of 5/3

2. square root of 12x cubed/5 find slope & y intercept
2x - 3y = 6