What two numbers multiply to 840 and add up to -61?




Here we answer the question: "What two numbers multiply to 840 and add up to -61?"

The answer to your question is:

-40 and -21


Below we illustrate and prove that -40 and -21 multiply to 840 and add up to -61:

-40 × -21 = 840
-40 + -21 = -61

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

x2 - 61x + 840 = 0

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

(x - 40 ) (x - 21)

To summarize, since -40 and -21 multiply to 840 and add up -61, you know that the following is true:

x2 - 61x + 840 = (x - 40 ) (x - 21)


Multiply To One Number and Add Up To Another
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