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16 May, 22:22

In the equation y=3x2+bx-10 what is the value of b if the x-coordinate of the vertex is - 5?

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  1. 16 May, 22:41
    0
    Hello,

    Here is a rapid method.

    y=3x²+bx-10

    y'=6x+b=0 with x=-5==>-30+b=0==>b=30
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