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Sarah wants to hang a mirror in her room but the mirror and frame must not have an area larger than 15 square feet. The mirror is 3 feet wide and 4 feet long. Which quadratic equation represents the area of the mirror and frame combined? (The frame must have equal width of x on each side.)
3x2 + 14x − 2 = 0
4x2 + 14x − 3 = 0
x2 + 12x − 14 = 0
2x2 + 7x − 14 = 0
 one year ago
 one year ago
Sarah wants to hang a mirror in her room but the mirror and frame must not have an area larger than 15 square feet. The mirror is 3 feet wide and 4 feet long. Which quadratic equation represents the area of the mirror and frame combined? (The frame must have equal width of x on each side.) 3x2 + 14x − 2 = 0 4x2 + 14x − 3 = 0 x2 + 12x − 14 = 0 2x2 + 7x − 14 = 0
 one year ago
 one year ago

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rebeccaskell94Best ResponseYou've already chosen the best response.0
Well to find the area of a rectangle we do S + S x 2 or s•s + s•s so we have 3 +4 x 2 = x or 3 x 3 + 4 x 4 = x @lgbasallote Righto?
 one year ago

rebeccaskell94Best ResponseYou've already chosen the best response.0
So far at least haha obviously not the full answer yet but I want to make sure I'm on the right track.
 one year ago

Nick2019Best ResponseYou've already chosen the best response.1
umm i really dont know but if you get the wrong answer no big deal :)
 one year ago

rebeccaskell94Best ResponseYou've already chosen the best response.0
lol no problem xD
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
Mmm, I don't quite see what you're saying there. I don't think it's right.
 one year ago

rebeccaskell94Best ResponseYou've already chosen the best response.0
Well we have to find the initial area before doing the next part xD lol idk @nick SmoothMath is a dollface he's really good at helping :D I'll shut up now :x
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
That's a thought, Becca, but this will work better. First, Nick, simply draw a picture, like this dw:1341586226088:dw See how I drew the mirror, 3X4, and then the frame around it has a width of x?
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
To find the area, we need to do L*W, but first, we should write an expression for how long L is and another for how long W is. See if you can do that on your own.
 one year ago

Nick2019Best ResponseYou've already chosen the best response.1
ok thanks for the help
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
Haha don't leave yet. Tell me what you get for how long L is.
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.0
i think what @rebeccaskell94 did is a variation of the perimeter...looks like combo of perimeter and area
 one year ago

rebeccaskell94Best ResponseYou've already chosen the best response.0
oh pffft my bad. I need to stop helping people in math xD
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.0
lol dont get discouraged!!
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
Becca, the best way to learn something is to teach it. Just try to make sure you understand it before you teach =)
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.0
like einstein said...if you cant explain it simply then you dont understand it fully
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
Great quote =) I try to let it inform my teaching style.
 one year ago
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