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anonymous
 5 years ago
how do i solve y=x^24x45 to find all x intercepts
anonymous
 5 years ago
how do i solve y=x^24x45 to find all x intercepts

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0How do you do that? can you help?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Well you want to make it into (x+a)(x+b) form

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so when you remultiply it it gives you x^2+ax+bx+ab

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0what are some values of a and b that could give you ab=45?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0right, note that one of them needs to be negative. Now how would you make ax+bx = 4x from your 9 and 5?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0is the answer possibly 5 and 9?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0why yes it is. so what does your y=(x+a)(x+b) become?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you have your a and b values backwards actually. when you multiply (x5)(x+9) = x^2+4x45

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yes those are your a and b values. Next you need to find values of x to provide 0=(x9)(x+5) those will be when your y=0
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