anonymous
  • anonymous
A picture 17 inches by 20 inches is to be mounted on a piece of matboard so that there is an even amount of mat all around the picture. How wide will the border be if the area of the mounted picture is 598 square inches?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
17x(20x) = 598 right?
amistre64
  • amistre64
or rather: (17+2x)(20+2x) = 598
anonymous
  • anonymous
yes. i need the width of the border

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amistre64
  • amistre64
340 +40x +34x +4x^2 340 +74x +4x^2 x = -74/16 + sqrt(74^2 -4(4)(340))/16 then
amistre64
  • amistre64
16 meant 8 lol
amistre64
  • amistre64
lets me test 8.5
anonymous
  • anonymous
test 8.5?
amistre64
  • amistre64
dint work out as expected :)
amistre64
  • amistre64
musta missed cued in the calculator; let me try that again
amistre64
  • amistre64
i forgot to -580
anonymous
  • anonymous
oh. the book gives me a hint that its a solution between 3 and 7 inches
amistre64
  • amistre64
-598.. i got no short termmemory lately..
amistre64
  • amistre64
ok, when i do it correctly, I get x=3 so lets try to dbl chk that
anonymous
  • anonymous
3 could be right. thats what i got
amistre64
  • amistre64
17+2(3) = 23 20 + 2(3) = 26 23(26) = 598, its good
anonymous
  • anonymous
ok. thanks for confirming
anonymous
  • anonymous
medal
amistre64
  • amistre64
yw :)

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