Select the two values of x that are roots of this equation. 3x – 5 = -2×2 O A. x= 1 O B. x=- x= -2 NIU O

Question

Select the two values of x that are roots of this equation.
3x – 5 = -2×2
O A. x= 1
O B. x=-
x= -2
NIU
O C. x= 2
D. x= -1
3
Help please

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bonexptip 4 years 2021-07-19T12:39:37+00:00 1 Answers 12 views 0

Answers ( )

  1. thongdat2
    0
    2021-07-19T12:41:00+00:00
    Reply

    Answer:

    x = 1 or -5/2

    Step-by-step explanation:

    -2x^2 – 3x + 5 = 0

    multiply all through by -1

    2x^2 + 3x – 5 = 0

    ……. 2x^2 × 5 = 10x^2 = +5x × -2x

    (2x^2 + 5x)-(2x – 5) = 0

    x(2x + 5) – 1(2x + 5) = 0

    x – 1 = 0 or 2x + 5 = 0

    x = 1 or 2x = – 5

    x = 1 or -5/2

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