Question 813509: the length of a poster is 10cm longer than its width. if the area of the poster is 1200cm square, what is the width of the poster.
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! L = w + 10
Lw = 1200
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Lw = 1200
(w + 10)w = 1200
ww + 10w - 1200 = 0
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the above quadratic equation is in standard form, with a=1, b=10, and c=-1200
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to solve the quadratic equation, plug this:
1 10 -1200
into this: https://sooeet.com/math/quadratic-equation-solver.php
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Answer 1:
the quadratic equation has two real roots:
root1 = 30
root2 = -40
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the negative root doesn't make sense for a length, so use the positive root.
w = 30 cm
L = 40 cm
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