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Diana.xL

  • one year ago

http://prntscr.com/8gj6a8 I need a full step explanation.

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  1. marigirl
    • one year ago
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    |dw:1442308220092:dw| So basically what they are asking is that .. what can you multiple (x+15) by in order to obtain \[x^2+18x+45\]

  2. marigirl
    • one year ago
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    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)

  3. marigirl
    • one year ago
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    Can you see what im getting at? \[(x+15)(x+?)=x^2+18x+45\]

  4. marigirl
    • one year ago
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    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?

  5. Jhannybean
    • one year ago
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    \[\text{hi}\]

  6. anonymous
    • one year ago
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    factorise it

  7. anonymous
    • one year ago
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    \[x ^{2} + 18x +45 \]

  8. anonymous
    • one year ago
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    do u know how to factorise ?

  9. anonymous
    • one year ago
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    so basically you must get two values when add gives you +18 and when multiply you get +45

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