SOLUTION: A square picture has a 1-centimeter border around it. Half of the total area of the picture and the border is made up by the border. Use a graph to determine the dimensions of the

Question 66092: A square picture has a 1-centimeter border around it. Half of the total area of the picture and the border is made up by the border. Use a graph to determine the dimensions of the picture to the nearest tenth centimeter.
Choices:
A) 2.4cm by 2.4cm
B) 4.8cm by 4.8cm
C) 2cm by 2cm
D) 4.1 cm by 4.1cm
Found 2 solutions by josmiceli, venugopalramana:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
The area of tyhe border is
where x is the width of the square picture

without the border
A = area of picture

(B) is the correct choice

This is approximately correct
Answer by venugopalramana(3286) (Show Source): You can put this solution on YOUR website!
A square picture has a 1-centimeter border around it. Half of the total area of the picture and the border is made up by the border. Use a graph to determine the dimensions of the picture to the nearest tenth centimeter.
Choices:
A) 2.4cm by 2.4cm
B) 4.8cm by 4.8cm
C) 2cm by 2cm
D) 4.1 cm by 4.1cm
BORDER WIDTH = 1 CM
LET PICTURE BE OF SIDE X CM.
AREA OF PICTURE = X^2
HENCE INCLUDING BORDER OF 1 CM ON ALL SIDES, THE SQUARE WILL BE
OF SIDE (X+1+1)=X+2
AREA OF PICTURE WITH BORDER =(X+2)^2
AREA OF BORDER=(X+2)^2-2X^2
WE GOT
(X+2)^2-X^2=[(X+2)^2]/2= Y SAY
WE CAN SOLVE THIS BY DRAWING GRAPHS OF
Y=2X^2...AND...........Y=(X+2)^2.........

WE FIND THAT THE 2 CURVES INTERSECT AT X=4.8 CM
HENCE THE PICTURE WITH BORDER HAS
6.8 CM SIDE AND PICTURE HAS 4.8 CM SIDE.
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