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18 September, 11:12

X2+2x-15=0 factorising

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Answers (2)
  1. 18 September, 11:20
    0
    x²+2x-15 = (x-3) (x+5)

    Step-by-step explanation:

    hello:

    x²+2x-15=0

    (x²+2x+1) - 1-15=0

    (x+1) ²-16=0

    (x+1) ²-4² = (x+1-4) (x+1+4) use identity : a²-b² = (a-b) (a+b)

    x²+2x-15 = (x-3) (x+5)
  2. 18 September, 11:32
    0
    (x-3) (x+5)

    Step-by-step explanation:

    x²+2x-15 find two numbers that add to make + 2 and make a product of - 15

    -3*5=-15

    -3+5=2

    (x-3) (x+5)
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