Answer
x =(24-√816)/2=12-2√ 51 = -2.283
x =(24+√816)/2=12+2√ 51 = 26.283
Step-by-step explanation:
(Same thing)
x =(24-√816)/2=12-2√ 51 = -2.283
x =(24+√816)/2=12+2√ 51 = 26.283
X^2-2x -3 =0
a =1 b =-2 and c = -3
x = - (-2) +/- sqrt (-2)^2 - 4(1)(-3)
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2(1)
x = + 2 +/- sqrt [(4) - 4(-3)]
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2
x = +2 +/- sqrt [4 + 12]
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2
x = +2 +/- sqrt[16]
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2
x = +2 +/- (4)
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2
x = 2 + 4 or 2 -4
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2 2
x = 6/2 or -2/2
x = 3 or x = -1
If the two of you can wash 1 car in 6 minutes:
It will take you 10 minutes to wash the car alone
take your friend 15 minutes to wash the car alone
Let the duration you can work be represented by y
Let the duration your friend can work be represented by x
You can wash a car 1.5 times as fast as your friend
That is, y = 1.5x
Working together, the two of you can wash 1 car in 6 minutes
This can be represented by the equation
Substitute x = 1.5y into the equation above
It will take you 10 minutes to wash the car alone
Substitute y = 10 into x = 1.5y
x = 1.5(10)
x = 15 minutes
It will take your friend 15 minutes to wash the car alone
Learn more here: brainly.com/question/25547756
Answer:
-16
Step-by-step explanation:
-a/3 >5,,,, a/3 < - 5,,,,,, a< - 15 hence a should be - 16