anonymous
  • anonymous
factor 9u^2+42u+49 Please help! D:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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welshfella
  • welshfella
Hint: this is a perfect square take the square roots of the first and last terms
anonymous
  • anonymous
3 and 7?
anonymous
  • anonymous
oh 45u+7?

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welshfella
  • welshfella
the 7 is right ( well its + 7) but dont forget the u^2
anonymous
  • anonymous
OK so now what now that i have45u+7?
welshfella
  • welshfella
its not 5u - what is the square root of 9u^2
anonymous
  • anonymous
3u. but i added that to the 42u and got 45u
welshfella
  • welshfella
- no you cant do that these trinomials ( also called quadratics) factor out to the form (a + b)(c + d) in this case its (a + b)(a + b) where the middle term = 2ab in this case 2ab = 42u
anonymous
  • anonymous
oh im kind of confused...
welshfella
  • welshfella
|dw:1433688118015:dw|
welshfella
  • welshfella
first the a multiplies the second bracket then the b does the same
anonymous
  • anonymous
OH!! So I need the 2 parts to equal the original equation?
welshfella
  • welshfella
yes
anonymous
  • anonymous
Okay I get it now I think :)
welshfella
  • welshfella
so the factors are ?
welshfella
  • welshfella
( 3u + 7)( 3u + 7)
anonymous
  • anonymous
thank you! :)
anonymous
  • anonymous
so its (3u+7)^2?
welshfella
  • welshfella
yes
anonymous
  • anonymous
Thank you :3 I get it now
welshfella
  • welshfella
yw
anonymous
  • anonymous
Also can you help me with one more?
anonymous
  • anonymous
9-4z^2 that would be (3-2z)^2?
anonymous
  • anonymous
multiply it out and check

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