exam Maths Puzzle Numerical Ability

Can you please show me step by step how to solve the following;

Solve by completing the square
x^2+8x+13=0

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exam Other Question

what are the steps to graphing 3y squared - x squared = 25? Given: angle DEG = (x +3y)
angle GEF = (2x+y)
angle DEF is a right angle

a. solve for y in terms of x
~My answer= I HAVE NO CLUE AS TO SOLVING THIS S