SOLUTION: the area of a rectangular picture is 160 cm ( squared)and the width is 4 cm less than the length, find this width in cm, correct significant figures

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Question 1074366: the area of a rectangular picture is 160 cm ( squared)and the width is 4 cm less than the length, find this width in cm, correct significant figures
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52779) About Me  (Show Source):
You can put this solution on YOUR website!
.
x*(x+4) = 160,

x^2 + 4x - 160 = 0,

x = -4+%2B-+sqrt%2816+%2B+4%2A160%29%29%2F2 = %28-4+%2B-+sqrt%28656%29%29%2F2.


The only meaningful positive root is %28sqrt%28656%29+-+4%29%2F2 = 10.806 (approximately).



Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
the area of a rectangular picture is 160 cm ( squared)and the width is 4 cm less than the length, find this width in cm, correct significant figures
Width: highlight_green%28matrix%281%2C2%2C+10.8062%2C+cm%29%29

Round off to the number of significant figures needed!!