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Mathematics
Rylee Crane
12 July, 07:29
A+B = - 7 and AXB = - 15
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Jaiden Yu
12 July, 11:16
0
A+b=-7
ab=-15
a=-7-b
b (-7-b) = - 15
a=-7-b
-b^2-7b+15=0
a=-7-b
b^2+7b-15=0
a=-7-b
b = (-7±sqrt (109)) / 2
1)
a=-7-b
b = (-7+sqrt (109)) / 2
b = (-7+sqrt (109)) / 2
a=-7+3.5-sqrt (109) / 2
b = (-7+sqrt (109)) / 2
a=-3.5-sqrt (109) / 2
2)
a=-7-b
b = (-7-sqrt (109)) / 2
b = (-7-sqrt (109)) / 2
a=-7+3.5+sqrt (109) / 2
b = (-7-sqrt (109)) / 2
a=-3.5+sqrt (109) / 2
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