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28 December, 07:11

Find the values for "a" and "b" that would make the equality true

-5 (3x^2+5x+b) = ax^2-25x+45

a=

b=

+2
Answers (1)
  1. 28 December, 07:30
    0
    a = - 15 and b = - 9

    distribute the left side of the equation

    - 15x² - 25x - 5b

    for - 15x² - 25x - 5b and ax² - 25x + 45 to be equal then the coefficients of like terms must be equal, hence

    - 15x² = ax² ⇒ a = - 15

    - 5b = 45 ⇒ b = - 9
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