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17 June, 18:49

If 4x^2 - bx + 81 is a perfect square trinomial. Then the value of b is

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  1. 17 June, 19:06
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    b = 36

    Step-by-step explanation:

    perfect square: a² - 2ac + c²

    4x² - bx + 81 = (2x) ² - bx + 9² = (2x) ² - 2 * (2x) * (9) + 9² = (2x) ² - 36x + 9²,

    so b = 36
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