book Maths Puzzle Numerical Ability

x^4-3x^2+2=0

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Line 2 is perpendicular to a line that passes through the points (4,-3) and (-2,6). How do I find the slope intercept (y=mx+b) and the general form (Ax+By=C)? -2-4+7+3(-4)+17 integers of /245 4&5 or 15&16 or 49&50 17&18