mrsfitz98
15.07.2019 •
Mathematics
If the square of a positive integer is acfef to 3 times the intger, tbe result is 40. find the intger
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Ответ:
I think the answer to your question is 2 and the integer is 10 because when you multiply the square root of 2 which is 4 times 10 which is equal to the result 40. hope this helps and I wasn't sure so I gave it my best guess.
Ответ:
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