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14 May, 10:15

Solve the equation 7x^2-8x=-1

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  1. 14 May, 10:25
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    7x²-8x=-1

    7x²-8x+1=0

    on theorem Vieta if 7-8+1=0 ⇒x₁=1

    (7x²-7x) - (x-1) = 0

    7x (x-1) - (x-1) = 0

    (x-1) (7x-1) = 0

    x₂=1/7

    Answer: x₁=1 x₂=1/7
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