solve the following by factolisation formula 1. x(2x+1)=0 2.4xsquere-11-3x=0​

Question

solve the following by factolisation formula
1. x(2x+1)=0
2.4xsquere-11-3x=0​

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Thiên Hương 3 years 2021-08-06T18:57:33+00:00 2 Answers 12 views 0

Answers ( )

  1. thongdat2
    0
    2021-08-06T18:58:48+00:00
    Reply

    1. x(2x+1)=0
    It means x=0 or 2x+1=0. So
    x=0

    2x+1=0
    2x=-1
    x=-1/2

    2.

    ➡️. 4x^2-3x-11=0
    (It must take the form of ax^2+bx+c=0)

    4x^2-3x=11
    ➡️ 4x^2-3x+9/4=11+9/4 ( you take the half of the number of 3 from 3x and square it. The half of 3 is 3/2 and when you square it becomes 9/4.)

    ➡️ 4x^2-3x+9/4=31/4

    ➡️. [4x^2-3/2]=31/4
    ( You put 9/4 in square root first. That means 3/2. since 3x is negative you also take negative for 3/2.)

    ➡️ 4x^2-3/2= positive or negative 31/4.

    ➡️. 4x^2=31/4+3/2

    ➡️. 4x^2= 37/4

    ➡️. x^2= 37/8

    ➡️. x= the square root of 37/8

  2. Farah
    0
    2021-08-06T18:59:04+00:00
    Reply

    1.

    X = 0

    2x + 1 = 0

    X = 0

    X = – ½ (Because we brought the numbers from one side to the other)

    2.

    Not sure for number 2.

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