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30 July, 23:56

If (mx + 7) (5x + n) = px^2+15x+14, what is m (n+p) ?

A) - 10

B) - 520

C) 480

D) 2

E) 520

+5
Answers (2)
  1. 31 July, 00:07
    0
    (mx + 7) (5x + n) = 5mx^2 + mnx + 35x + 7n

    = 5mx^2 + (35 + mn) x + 7n

    = px^2 + 15x + 14

    7n = 14

    n = 2

    35+mn = 15

    35 + m (2) = 15

    35 + 2m = 15

    2m = 15-35

    2m = - 20

    m = - 10

    p = 5m

    = 5 (-10)

    =-50

    m (n + p) = - 10 (2 - 50)

    = 480
  2. 31 July, 00:17
    0
    The answer you are looking for is C
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