What two numbers multiply to 90 and add up to -21?

Here we answer the question: "What two numbers multiply to 90 and add up to -21?"

The answer to your question is:

-15 and -6

Below we illustrate and prove that -15 and -6 multiply to 90 and add up to -21:

-15 × -6 = 90
-15 + -6 = -21

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

x² - 21x + 90 = 0

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

(x - 15 ) (x - 6)

To summarize, since -15 and -6 multiply to 90 and add up -21, you know that the following is true:

x² - 21x + 90 = (x - 15 ) (x - 6)

Multiply To One Number and Add Up To Another
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