anonymous
  • anonymous
Mary wants to hang a mirror in her room. The mirror and frame must have an area of 7 square feet. The mirror is 2 feet wide and 3 feet long. Which quadratic equation can be used to determine the thickness of the frame, x? Square with an inner frame with height of 2ft on the left frame and width of 3ft on the top. Arrow on the bottom frame with an x and an arrow on the right frame with an x. x2 + 14x − 2 = 0 2x2 + 10x − 7 = 0 3x2 + 12x − 7 = 0 4x2 + 10x − 1 = 0
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
1 Attachment
Mehek14
  • Mehek14
\((2x+2)(2x+3)=7\) do you know FOIL?
anonymous
  • anonymous
No....

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Mehek14
  • Mehek14
\(2x*2x\\2x*3\\2*2x\\2*3\)
Mehek14
  • Mehek14
|dw:1439416254215:dw|
anonymous
  • anonymous
Oh I see ok so I just Multiply all of these? 2x∗2x 2x∗3 2∗2x 2∗3
Mehek14
  • Mehek14
yes
anonymous
  • anonymous
alright!
anonymous
  • anonymous
4x and 6x and 4x and 6x
Mehek14
  • Mehek14
\(4x^2+6x+4x+6\)
Mehek14
  • Mehek14
\(6x+4x=\)
anonymous
  • anonymous
10x?
Mehek14
  • Mehek14
correct \(4x^2+10x+6=7\) \(6-7=\)
anonymous
  • anonymous
its 1
Mehek14
  • Mehek14
nope
Mehek14
  • Mehek14
7-6 = 1 6-7 = ?
anonymous
  • anonymous
Oh wait -1
Mehek14
  • Mehek14
correct
Mehek14
  • Mehek14
\(4x^2+10x-1=0\)
anonymous
  • anonymous
Ah so D ok thank you VERY MUCH!
Mehek14
  • Mehek14
yw ^_^

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