Here we answer the question: "What two numbers multiply to 21 and add up to 10?"
The answer to your question is:
3 and 7
Below we illustrate and prove that 3 and 7 multiply to 21 and add up to 10:
3 × 7 = 21
3 + 7 = 10
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 + 10x + 21 = 0
If so, the solution to factor the quadratic equation above is:
(x + 3 ) (x + 7)
To summarize, since 3 and 7 multiply to 21 and add up 10, you know that the following is true:
x2 + 10x + 21 = (x + 3 ) (x + 7)
Multiply To One Number and Add Up To Another
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