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10 May, 05:57

What is (3x-4) (7x+4)

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Answers (2)
  1. 10 May, 06:49
    0
    Answer:21x^2-16x-16

    Step-by-step explanation:

    (3x) (7x) + (3x) (4) + (-4) (7x) + (-4) (4) =

    21x^2+12x-28x-16

    21x^2-16x-16
  2. 10 May, 09:42
    0
    21x^2 - 16x - 16

    Step-by-step explanation:

    This is a basic multiplication question,

    We all know that (a+b) (c+d) = ac+ad+bc+bd

    Here,

    a = 3x

    b = - 4

    c = 7x

    d = 4

    Therefore,

    3x*7x + 3x*4 + (-4) * 7x + (-4) * 4

    => 21x^2 + 12x - 28x - 16

    => 21x^2 - 16x - 16
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