What two numbers multiply to 4 and add up to 5?




Here we answer the question: "What two numbers multiply to 4 and add up to 5?"

The answer to your question is:

1 and 4


Below we illustrate and prove that 1 and 4 multiply to 4 and add up to 5:

1 × 4 = 4
1 + 4 = 5

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

x2 + 5x + 4 = 0

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

(x + 1 ) (x + 4)

To summarize, since 1 and 4 multiply to 4 and add up 5, you know that the following is true:

x2 + 5x + 4 = (x + 1 ) (x + 4)


Multiply To One Number and Add Up To Another
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