math,help
posted by jasmine20 .
this is what i have left but i don't know how to finish it.
THe length of a rectangle is 1cm more than 4 times its width. if the area of the rectangle is 74cm^2, find the dimensions of the rectangle to the nearest thousandsth.
so then:
a =Lw
A = 74
W= W
L=4W+1
FROM ALL THIS I END UP WITH
0 = 4W^2+W74
THEN I USED THE QUADRATIC EQUATION
AND I AM IN THIS STEP:
X=(1 +/ sqrt 1185)/(8) from here is what i don't know .
It's really simple. If you follow thw steps i showed you in your previous question you'll get it. You have the right values, not just do the math.
1 minus sqrt(1185)/8 and 1 plus sqrt(1185)/8. Obviously your negative answer is the wrong one
i get this:
width : 4.2cm
length: 17.8cm
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