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Discrete Mathematics

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16. What is the value of a that would make the matrix equation true?:

( 1 -2) (-5 6) (a b)
( 3 4) (7 -8) = (c d)

  • Discrete Mathematics -

    Just multiply the matrices
    a = (1)(-5)+(-2)(7)
    b = (1)(6)+(-2)(-8)
    c = (3)(-5)+(3)(7)
    d = (3)(6)+(3)(-8)

  • Discrete Mathematics -

    For the matrices I came up with the following:
    a. -5 + -14 = -19

    b. 6 + 16 = 22

    c. -15 + 21 = 6

    d 18 + -24 = -6

    Is this right? What am I suppose to do afterwards?

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