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Aloiza [94]
2 years ago
14

What two numbers can be multiplied to get negative 14 but also add to get positive 5

Mathematics
1 answer:
Svetach [21]2 years ago
4 0
The numbers:  x, y
x·y=-14
x+y=5    ⇒    y=5-x
Substitute y in the first equation by y from second one
x·(5-x)=-14
5x-x²=-14
-x²+5x+14=0
-x²-2x+7x+14=0
-x(x+2)+7(x+2)=0
(x+2)(-x+7)=0
Product is 0 if one of factors is 0
x+2=0      or        -x+7=0
x=-2         or         -x=-7
x=-2         or           x=7
Now back to the equation y=5-x
y=5-(-2)    or     y=5-7
y=7           or     y=-2

The numbers are -2 and 7
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