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sergey [27]
4 years ago
8

The area of a square can be represented by the trinomial 9x^2 - 54x + 81. Which of the following is the length of one side of th

e square?
*free response question
Mathematics
1 answer:
Mnenie [13.5K]4 years ago
3 0

Use\ (a-b)^2=a^2-2ab+b^2\\\\9x^2-54x+81=\underbrace{(3x)^2-2(3x)(9)+9^2}_{(*)}=(3x+9)^2\\\\\text{The formula of an area of a square with a side x:}\ A=x^2.\\\\\text{Therefore we have answer:}\ The\ length\ of\ side\ of\ the\ square\ is\ 3x+9.

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4 0
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assume the substance has a half-life of 11 years and the initial amount is 126 grams.How long will it be until only 15 % remains
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Take the log of both sides :

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Multiply both sides by 11 :

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geniusboy [140]

Answer:

Step-by-step explanation:

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8 0
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Read 2 more answers
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PIT_PIT [208]
The expression represents four times the difference of 64 and 18 is
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I hope this correct :)
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