book Maths Puzzle Numerical Ability

Could you help me to complete the square to solve x^2-8x-12=0?

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What is the angle in degrees whose sine is 5.1/11.05 (Opp/Hyp). Please show work I'm really in Geometry and I have a problem about proving right triangles congruent with algebra. The problem is this: On triangle # 1, one leg is y-x and the hypotenuse is 3y+x. O