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16 October, 08:01

If (2x-3) and (x+5) are multiplied to form the trinomial ax^2 + bx+c, what is the value of b

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Answers (2)
  1. 16 October, 09:36
    0
    B will be - 3 + 2*5 = 7
  2. 16 October, 11:30
    +1
    (x + 5) (2x - 3) =

    x (2x - 3) + 5 (2x - 3) =

    2x^2 - 3x + 10x - 15 =

    2x^2 + 7x - 15 ... so b = 7 <==
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