What two numbers multiply to 7 and add up to 8?

Here we answer the question: "What two numbers multiply to 7 and add up to 8?"

The answer to your question is:

1 and 7

Below we illustrate and prove that 1 and 7 multiply to 7 and add up to 8:

1 × 7 = 7
1 + 7 = 8

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

x² + 8x + 7 = 0

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

(x + 1 ) (x + 7)

To summarize, since 1 and 7 multiply to 7 and add up 8, you know that the following is true:

x² + 8x + 7 = (x + 1 ) (x + 7)

Multiply To One Number and Add Up To Another
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