exam Maths Puzzle Numerical Ability

(x+1)(x+2)(x+3)(x+4) = 120

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Find the equation of the line through the point (4,3)that is perpendicular to y=4x-8. Write your answer in slope-itercept form I need help with another problem. I am solving for b using a^2+b^2=c^2, where a=9, and c = square root of 17. When I worked through, I came up with
b^2=-64. This doesnt seem right.