What two numbers multiply to 640 and add up to 88?

Here we answer the question: "What two numbers multiply to 640 and add up to 88?"

The answer to your question is:

8 and 80

Below we illustrate and prove that 8 and 80 multiply to 640 and add up to 88:

8 × 80 = 640
8 + 80 = 88

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

x² + 88x + 640 = 0

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

(x + 8 ) (x + 80)

To summarize, since 8 and 80 multiply to 640 and add up 88, you know that the following is true:

x² + 88x + 640 = (x + 8 ) (x + 80)

Multiply To One Number and Add Up To Another
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