What two numbers multiply to negative 8 but add to negative 7

Question

Mathematics

Lowe

17 May, 08:32

What two numbers multiply to negative 8 but add to negative 7

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Answers (1)

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Ryan Contreras · Answer 1

Let "a" and "b" be the two numbers

So a*b=-8 and a+b=-7

Therefore S=-7 and P=-8

Using (x^2) - S+P=0 = > (x^2) - (-7) + (-8) = 0 = > (x^2) + 7-8=0

By factorizing we get (x+8) (x-1) = 0

So a can be either - 8 or 1 and b can be 1 or - 8

Meaning that the two numbers are - 8 and 1.