anonymous
  • anonymous
how do i solve y=x^2-4x-45 to find all x intercepts
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Factor!
anonymous
  • anonymous
How do you do that? can you help?
anonymous
  • anonymous
Well you want to make it into (x+a)(x+b) form

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
so when you remultiply it it gives you x^2+ax+bx+ab
anonymous
  • anonymous
what are some values of a and b that could give you ab=-45?
anonymous
  • anonymous
9 and 5
anonymous
  • anonymous
right, note that one of them needs to be negative. Now how would you make ax+bx = -4x from your 9 and 5?
anonymous
  • anonymous
-5
anonymous
  • anonymous
is the answer possibly 5 and -9?
anonymous
  • anonymous
why yes it is. so what does your y=(x+a)(x+b) become?
anonymous
  • anonymous
(x-5) and (x+9)
anonymous
  • anonymous
you have your a and b values backwards actually. when you multiply (x-5)(x+9) = x^2+4x-45
anonymous
  • anonymous
so its -9 and +5?
anonymous
  • anonymous
yes those are your a and b values. Next you need to find values of x to provide 0=(x-9)(x+5) those will be when your y=0
anonymous
  • anonymous
NO WAIT -5 and 9

Looking for something else?

Not the answer you are looking for? Search for more explanations.