Question

PLEASE HELP!!! REALLY QUICKLY!!!
Sarah wants to hang a mirror in her room. The mirror and frame must have an area of 15 square feet. The mirror is 3 feet wide and 4 feet long. Which quadratic equation can be used to determine the thickness of the frame, x?

Answer 1

3x2 + 14x - 2 = 0
4x2 + 14x - 3 = 0
x2 + 12x - 14 = 0
2x2 + 7x - 14 = 0

Answer 2

so for (a). you can use quadratic formula
Step 1:- A = 1, B = 5 and C = -6
Step 2:- D = b2 -4ac,
Step 3:- D= 5x2 – 4 * 6,
Step 4:- D= 25 – 24,
Step 5:- D = 1,
since D>0, So
x1 = (-2),
x2 = (-3),
The factors are (x + 2), (x + 3).
Answer = (x + 2), (x + 3).
understand?
answer should be c

Answer 3

Drawing it can be very helpful.
Draw a rectangle 3 ft by 4 ft.
Then draw a rectangle around it to be the frame. Label the width of the frame x.
Then find the length and width of the frame in terms of 3 ft and x and 4 ft and x, multiply them together, and set it equal to 15.

Answer 4

@adajiamcneal Thanks so much! =)
@mathstudent55 I posted the attached pic of the mirror above thx tho =)

Answer 5

np :)

Answer 6

@adajiamcneal R u sure it's C, i want to make sure i get this right =) thx

Answer 7

im not 100% but im 99.9 % sure if that helps aha

Answer 8

Okay cool, will u help me with another one? pls =)

Answer 9

yeah

Answer 10

@adajiamcneal
What question are you answering? It's not this problem.

Answer 11

okay, thanks here is the second one =)

Which statement justifies that 3x2 - x - 5 multiplied by 2x2 - x - 3 obeys the closure property of multiplication?

The result 6x4 + x2 + 15 has a degree of 4.
The result 6x4 + x2 + 15 is a trinomial.
The result 6x4 - 5x3 - 18x2 + 8x + 15 is a polynomial.
The result 6x4 - 5x3 - 18x2 + 8x + 15 has a degree of 4.

Answer 12

@adajiamcneal

Answer 13

https://answers.yahoo.com/question/index?qid=20120729162821AAYCU9h

Answer 14

okay thx =)

Answer 15

Wait what was that link for @adajiamcneal ?

Answer 16

answers

Answer 17

To the second q?

Answer 18

The length of the mirror is 4 ft. With x width of frame on each side, the length of the frame is 2x + 4.
The width of the mirror is 3 ft. With x width of the frame on each side, the width of the frame is 2x + 3.
See the figure below.