exam Maths Puzzle Numerical Ability

The monthly profit P (in dollars) that Jim makes on the sale of x mobile homes is determined by the formula P = x2 + 5x - 50. Find the values of x for which Jim makes profit.

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exam Other Question
how would I solve for f1 in an equation that is V=speed(f1-f0)/(f1+f0). what is the equation for f1 How do I expand the following to include all stages:
2
(x+2)(x + 7)

Hope you can help me.