Word Problems - Solving Quadratic Equations by Factoring

[@ayubeghadamsi-s1b]

very helpful

[@yaryar5896]

This helped a lot, thank you!

[@yougotLOLED]

I did it in a few steps. Basically lets say the new dimensioned rectangles question, you could map it out. But the way she mapped it it must have confused you guys so let me make it simpler. Lets say our current expression is 20*6 and since there are new dimensions when the area is doubled, we can put the statement as: (x+20)(x+6)=240(that for which is the new rectangle we are talking about) Now see here it definitely looks like a quadratic equation. Expand it into: x^2 +26x+120=240 Now put 240 on the other side to make the who equation equalling to 0 x^2 +26x-120=0 Now factorise: (x+30)(x-4)=0 So, x=4, and x=-30 But forget about -30 because that isnt gonna be part of the equation since it is a negative number. Now we sub it back to the equation: (x+20)(x+6)=240 So substituting 4 into the equation, we get 24*10 Boom you got your answer!

[@1trainroute]

Helpful!

[@democount2589]

thank you

[@chrischeng9145]

First

[@waitwhat6692]

bruh

[@anishpatwardhan1023]

@@waitwhat6692 lol

[@jld2191]

Weacher