exam Maths Puzzle Numerical Ability

I need your help how do you solve x^2-2x-9=0

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exam Other Question

the square root of negaitve 0.64

the square root of 3/5

3 square root 2 plus 5 square root 2

3 square root 8 plus 2 square root 16

square root m squared over n squared
1. Find the slope: y=-3/2x + 5/3

2. Find the equation: slope-4 through point (-2,3)