book Maths Puzzle Numerical Ability

Complete the following statement x^2 + 2x - 80 = (x+10) ( )

This one is comfusing.

Can someone help please.

Thanks

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book Other Question

Can someone please help:

Write the equation of the circle with the given center and length of a radius. Express the final equation in the form X^2+Y^2+Dx+Ey+F=0
cCenter at (3,5) and r=2

Thanks
Charmaine Frank can type a report in 2hrs and james takes 5hrs. How long does it take them together?