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-37
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Steve
RossYour equations are then x+y = 3
and
xy = -40
Subtracting y from both sides of the first equation we get
x = 3 - y
Substituting this into the second equation we get
xy = -40
(3-y)y = -40
Expanding this we get
-y^2 + 3y = -40
Add 40 to both sides, and multiply by -1 to get
y^2 - 3y - 40 = 0
Factor this to
(y-8)(y+5) = 0
So the zeroes are at y = 8 and y = -5
which means x = -5 and x = 8
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What two numbers multiply to get -40 and add to get -3?
-43
What two numbers multiply together to equal -40 and add together to equal -3?
-43
How many integers between 1 and 40 are multiples of 3 or 7?
LCM of 3 and 7 under 40 is 21
What are to integers product -40 and sum -3?
-37
How do you multiply 3hrs 40mins by 7?
To multiply 3 hours 40 minutes by 7, first convert the time into minutes: 3 hours is 180 minutes (3 x 60) and add the 40 minutes, totaling 220 minutes. Then, multiply 220 by 7 to get 1540 minutes. To convert this back to hours and minutes, divide 1540 by 60 to get 25 hours and 40 minutes. So, 3 hours 40 minutes multiplied by 7 equals 25 hours 40 minutes.
