exam Maths Puzzle Numerical Ability

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.

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exam Other Question
(x+1)(x+2)(x+3)(x+4) = 120 I am studying chemical equilibriums, and am having trouble remembering the algebra. Can you please explain to me how when solving this equation for x: (3.2 - 2x)/x = 1480, x= .