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 2 years 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
 2 years 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

This Question is Closed

rebeccaskell94
 2 years ago
Best ResponseYou've already chosen the best response.0Well 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?

rebeccaskell94
 2 years ago
Best ResponseYou've already chosen the best response.0So far at least haha obviously not the full answer yet but I want to make sure I'm on the right track.

Nick2019
 2 years ago
Best ResponseYou've already chosen the best response.1umm i really dont know but if you get the wrong answer no big deal :)

rebeccaskell94
 2 years ago
Best ResponseYou've already chosen the best response.0lol no problem xD

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

rebeccaskell94
 2 years ago
Best ResponseYou've already chosen the best response.0Well 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

SmoothMath
 2 years ago
Best ResponseYou've already chosen the best response.2That'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?

SmoothMath
 2 years ago
Best ResponseYou've already chosen the best response.2To 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.

Nick2019
 2 years ago
Best ResponseYou've already chosen the best response.1ok thanks for the help

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

lgbasallote
 2 years ago
Best ResponseYou've already chosen the best response.0i think what @rebeccaskell94 did is a variation of the perimeter...looks like combo of perimeter and area

rebeccaskell94
 2 years ago
Best ResponseYou've already chosen the best response.0oh pffft my bad. I need to stop helping people in math xD

lgbasallote
 2 years ago
Best ResponseYou've already chosen the best response.0lol dont get discouraged!!

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

lgbasallote
 2 years ago
Best ResponseYou've already chosen the best response.0like einstein said...if you cant explain it simply then you dont understand it fully

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