Question

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

Answer 1

\((2x+2)(2x+3)=7\)
do you know FOIL?

Answer 2

No....

Answer 3

\(2x*2x\\2x*3\\2*2x\\2*3\)

Answer 4

Oh I see ok so I just Multiply all of these? 2x∗2x 2x∗3 2∗2x 2∗3

Answer 5

yes

Answer 6

alright!

Answer 7

4x and 6x and 4x and 6x

Answer 8

\(4x^2+6x+4x+6\)

Answer 9

\(6x+4x=\)

Answer 10

10x?

Answer 11

correct
\(4x^2+10x+6=7\)
\(6-7=\)

Answer 12

its 1

Answer 13

nope

Answer 14

7-6 = 1
6-7 = ?

Answer 15

Oh wait -1

Answer 16

correct

Answer 17

\(4x^2+10x-1=0\)

Answer 18

Ah so D ok thank you VERY MUCH!

Answer 19

yw ^_^