Solve the following quadratic equation by finding the value of x: x^2 + 8x + 7= 0 (include solving steps please)

Question

Solve the following quadratic equation by finding the value of x:

x^2 + 8x + 7= 0

(include solving steps please)

in progress 0
Thanh Hà 4 years 2021-08-31T10:40:53+00:00 1 Answers 4 views 0

Answers ( )

  1. ngockhue
    0
    2021-08-31T10:42:17+00:00
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    use the quadratic formula: (-b±√(b²-4ac))/(2a)

    a=1
    b=8
    c=7

    (-8±√(8²-4x1x7))/(2×1)

    x= -1
    x= -7

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )