Diana.xL
  • Diana.xL
http://prntscr.com/8gj6a8 I need a full step explanation.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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marigirl
  • marigirl
|dw:1442308220092:dw| So basically what they are asking is that .. what can you multiple (x+15) by in order to obtain \[x^2+18x+45\]
marigirl
  • marigirl
Here our factorising skills can come in handy. Can you factorize (i.e split into a pair of brackets) \[x^2+18x+45\] We know from the question one set of these brackets is going to be (x+15)
marigirl
  • marigirl
Can you see what im getting at? \[(x+15)(x+?)=x^2+18x+45\]

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marigirl
  • marigirl
I need two numbers that will multiply to 45 and those two very same numbers must add to 18.... I already have a clue to use 15 .. so what will be the other number?
Jhannybean
  • Jhannybean
\[\text{hi}\]
anonymous
  • anonymous
factorise it
anonymous
  • anonymous
\[x ^{2} + 18x +45 \]
anonymous
  • anonymous
do u know how to factorise ?
anonymous
  • anonymous
so basically you must get two values when add gives you +18 and when multiply you get +45

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