exam Maths Puzzle Numerical Ability

What is the product of the roots for the quadratic equation sqrt2x^2-4x+2=0?

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exam Other Question

Can anyone help me find the slope of a line with
6x+2y=8

I cannot seem to get x
I think it is 1.3 x/3 + y = 3
x/2 - y/4 = 1