Faisal tries to solve (x + 2)(x – 7) = 0 Here is his working. (x + 2) = 0 or (x – 7) = 0 Answer

Question

Faisal tries to solve
(x + 2)(x – 7) = 0
Here is his working.
(x + 2) = 0
or
(x – 7) = 0
Answer
x = 2
or
x=7
Give a reason why his answer is wrong.

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Thu Thảo 1 year 2021-08-31T14:58:49+00:00 2 Answers 1 views 0

Answers ( )

  1. MichaelMet
    0
    2021-08-31T14:59:55+00:00
    Reply

    Step-by-step explanation:

    the steps he took are correct but the answer of x is somehow wrong because

    (x+2)=0

    x = -2

    and not x = 2

  2. minhkhoi
    0
    2021-08-31T15:00:08+00:00
    Reply

    Answer:

    He should have subtracted 2 from each side to find the solution for x+2 =0

    Step-by-step explanation:

    (x + 2)(x – 7) = 0

    Using the zero product property

    x+2 = 0   x-7=0

    x+2-2=0-2    x-7+7=0+7

    x = -2            x=7

    He should have subtracted 2 from each side to find the solution for x+2 =0

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