Friday

March 6, 2015

March 6, 2015

Posted by **Kelly** on Saturday, January 21, 2012 at 2:52am.

- Math, Quadratics -
**Mac**, Saturday, January 21, 2012 at 4:00amCurrent area = 200m2 [10m x 20m]

New area = 400m2 [10y x 20y]

So, 400 = 200y2

So, y2= 2

So, y = 1.41

So, each side must be increased by a factor 0f 1.41 times.

I this correct or do they mean add the same length to each side?

- Math, Quadratics -
**Damon**, Saturday, January 21, 2012 at 5:36amsame to each

(10+x)(20+x) = 400

200 + 30 x + x^2 = 400

x^2 + 30 x - 200 = 0

x = [ -30 +/- sqrt(900 + 800) ]/2

x = [ -30 +/- 10 sqrt 17 ] /2

x = -15 +/- 5 sqrt 17

x = 5.62

new dimensions

15.62 * 25.62 = 400 ok

- Math, Quadratics -
**Kelly**, Saturday, January 21, 2012 at 8:09amHi Damon, I got the same answer as you up to the equation x^2 + 30x - 200=0, but after that I don't understand what happened after that.. where does the 900 and 800 come form? and why you do divide by 2? thanks

**Answer this Question**

**Related Questions**

math,(fraction) - Adam and Rahmad shared some beads.if Adam gave one-third of ...

math - 5 hockey pucks and three hockey sticks costs $23. 5 hockey pucks and 1 ...

algebra - Adam is 3 times as old as Cynthia and Fred is 16 years younger than ...

Repost: English for Adam - english - adam, Monday, September 10, 2007 at 5:26pm ...

Math - 5 hockey pucks and three hockey sticks cost $23 5 hockey pucks and I ...

math - 5 hockey pucks and three hockey sticks cost $23. 5 hockey pucks and 1 ...

Algebra - Adam kicks the football in his backyard. The path of the football when...

math - Adam is 3 times as old as Cynthia and Fred is 16 years younger than Adam...

Math - Adam left the airport and traveled toward the Capital. Elisa left one ...

Math - Adam and Bob went apple picking in an orchard. At the end of the day, ...