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anonymous
 one year ago
how to factor x^2x20
anonymous
 one year ago
how to factor x^2x20

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mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0Since the coefficient of the x^2 term is 1, you need the following type of factoring: x^2 + ax + b 1. Find two numbers that multiply to b and add to a. Let's call these numbers p and q. 2. The factoring is simply (x + p)(x + q) In your case, if you compare x^2  x  20 to x^2 + ax + b, you have a = 1 and b = 20. You need two numbers that multiply to 20 and add to 1. What are two numbers that multiply to 20 and add to 1?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[x^2x20\\x^24x+5x20\\x(x4)+5(x4)\\(x4)[x+5]\\\]

mathstudent55
 one year ago
Best ResponseYou've already chosen the best response.0@eninone You wrote: \(x^2x20\) \(x^24x+5x20\) \(x(x4)+5(x4)\) \((x4)[x+5]\) Look at your second line: \(x^24x+5x20\) If you add like terms, you get: \(x^2+x20\) That is not the original polynomial. You need 5x and + 4x, not 4x and + 5x.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@mathstudent55 thanks, @kingban follow @mathstudent55
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