exam Maths Puzzle Numerical Ability

sqrt (5^2-4(2)(-3))

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exam Other Question

Are the following lines parallel, perpendicular, or neither?
L1 with equation x - 6y = 12
L2 with equation 6x + y = 6
I need help with solving this logarithmic equation

log5(x+1)+log5(x-1)=log5 8