<PRE><B>Question 925999</B>
L = 2w + 8
Lw = 90
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Lw = 90
(2w + 8)w = 90
2ww + 8w - 90 = 0
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the above quadratic equation is in standard form, with a=2, b=8 and c=-90
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to solve the quadratic equation, by using the quadratic formula, copy and paste this:
2 8 -90
into this solver: https://sooeet.com/math/quadratic-equation-solver.php
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the quadratic has two real roots at:
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w = 5
w = -9
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the negative root doesn&#39;t fit the problem statement, so use the positive root:
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w = 5
L = 2w + 8
L = 2*5 + 8
L = 18
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answer:
L = 18 inches 
w = 5 inches 
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php</PRE>