SOLUTION: A number squared is equal to 110 less than 21 times the number. Find the number

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Question 931492: A number squared is equal to 110 less than 21 times the number. Find the number
Answer by ptfile(81) About Me  (Show Source):
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Let x = The number
A number squared is equal to 110 less than 21 times the number.
x^2=21x-110
x^2-21x+110=0
(x-11)(x-10)=0
x=11
or
x=10
Substitute x for 11
11^2=21(11)-110
121 =231-110
121 =121
Substitute x for 10
10^2=21(10)-110
100 =210-110
100 =100
The width can either be 11 or 10.