What two numbers multiply to 8 and add up to 9?

Here we answer the question: "What two numbers multiply to 8 and add up to 9?"

The answer to your question is:

1 and 8

Below we illustrate and prove that 1 and 8 multiply to 8 and add up to 9:

1 × 8 = 8
1 + 8 = 9

Are you asking because you are trying to figure out how to factor the following quadratic equation?

x² + 9x + 8 = 0

If so, the solution to factor the quadratic equation above is:

(x + 1 ) (x + 8)

To summarize, since 1 and 8 multiply to 8 and add up 9, you know that the following is true:

x² + 9x + 8 = (x + 1 ) (x + 8)

Multiply To One Number and Add Up To Another
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