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November 28, 2014

November 28, 2014

Posted by **Michelle** on Wednesday, April 29, 2009 at 8:14pm.

A square field had 3 m added to its length and 2m added to its width. The area is 90 m2(squared). Find the length of a side of the original field.

So first you get (x+3)(x+2)=90, right?

then you get x2+5x+6=90

then x2+5x=84

How do you go on? How do you figure out x? I don't get it! I have other problems like those, could you tell me how to figure out a problem with x2 and something x = a number in general? Please help!

- Math -
**Quidditch**, Wednesday, April 29, 2009 at 8:23pmTake your step:

x^2 + 5x + 6 = 90

Now:

x^2 + 5x - 84 = 0

Factor by inspection or use the quadratic formula to solve for x.

A hint is what two factors of 84 differ by 5?

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