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After how many hours does he break even?
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Jan 17, 2019
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After how many hours does he break even?
Mathematics
high-school
Shyam Bhattacharyya
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Shyam Bhattacharyya
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1
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25+30x=5x²-10
5x²-30x-35=0
x²-6x-7=0 -7=-7*1, -6=-7+1
(x-7)(x+1)=0
x-7=0,
x=7 hours.
x+1=0, x=-1 (we cannot take negative for hours)
So, answer is 7
Check
y=25+30*7=235
y=5x²-10= 5*7²-10=245-10 =235
Slugslog
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Jan 24, 2019
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