(3+x)(7.5+x) = 3*7.5 + 5.5
solve for x, and then the new dimensions (in feet) are the factors on the left side above.
The dimensions of a door are 3 ft wide by 7 ft 6 in high. If the same amount is added to each dimension of the door, the area is increased by 5.5 ft2. Find the dimensions of the new door. (Round your answer to one decimal place.)
5 answers
can you show to do it
yeah, but you clearly need the practice. expand the left side, collect terms, and then just solve the quadratic equation, using the quadratic formula.
are the answers:
x=−0.218847
x=−10.2812
x=−0.218847
x=−10.2812
not likely to have negative dimensions for the door, are you?
Once you get an answer, check to see whether it makes sense!
Specifically, they said x was added to each dimension.
I get x = 0.5
How did you get your answers?
Once you get an answer, check to see whether it makes sense!
Specifically, they said x was added to each dimension.
I get x = 0.5
How did you get your answers?
1 answer