exam Maths Puzzle Numerical Ability

Could you please help me solve this by completing the square:

x^2+10x-8=0

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exam Other Question

i am a 5thgrader and i need help with varibles and expreesions can you please help me I can go back and graph what i see out of problems but not write the equation correctly. how do i write an equation for a hyperbola in standard form with vertices (0,8) (0,-8) and asymptotes y=positive or negative 4x?