exam Maths Puzzle Numerical Ability

#1) (2x-3) (4x+5)=0

#2) X to the second power -3x=0

How do I solve this?

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exam Other Question

Subtract. Simplify, if possible.

5-w/w-9 - 9w-7/9-w My problem is the polynomial function f(x)=0.004x^3-0.15x^2+4.9x + 7. Find the height of the track for x = 30