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If 49X2 - b = 7x …

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If 49X2 - b = 7x + 1/2 and 7x- 1/2 find the value of b

    • Posted by Meenakshi Kansal 5 years, 10 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Sia ? 5 years, 10 months ago

    49x2 - b = (7x+12)(7x−12)
    49x2 - b = (7x)2 - (12)2
    49x2 - b = 49x2 - 14
    b = 14

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