A+B = - 7 and AXB = - 15

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Mathematics

16 July, 16:00

A+B = - 7 and AXB = - 15

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Karter Wade · Answer 1

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