Asked by Kate
You are building a rectangular deck. The area of the deck should be 250 ft squared. You want the length of the deck to be 5 ft longer than twice its width. What should the dimensions of the deck be?
My work: 250=2x(x+5)
Is this correct so far?
My work: 250=2x(x+5)
Is this correct so far?
Answers
Answered by
Reiny
No, your definitions are not right
let the width be x
"the length of the deck to be 5 ft longer than twice its width" --- >length = 2x+5
then
x(2x+5) = 250
2x^2 + 5x - 250 = 0
(x - 10)(2x + 25) = 0
x = 10 or x is a negative, which makes no sense
width = 10
length = 25
check:
is the length 5 more than twice the width ?? yes
is the area 250 ? yes
let the width be x
"the length of the deck to be 5 ft longer than twice its width" --- >length = 2x+5
then
x(2x+5) = 250
2x^2 + 5x - 250 = 0
(x - 10)(2x + 25) = 0
x = 10 or x is a negative, which makes no sense
width = 10
length = 25
check:
is the length 5 more than twice the width ?? yes
is the area 250 ? yes
Answered by
Kate
Thank you
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