What is a simplified eCarlotta thinks that 3y + 5y3 is the same as 8y4. Which statement shows that it is NOT the same?Xpression for (x + y)

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What is a simplified eCarlotta thinks that 3y + 5y3 is the same as 8y4. Which statement shows that it is NOT the same?Xpression for (x + y) – (x – y)?

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Thành Đạt 4 years 2021-08-23T07:00:14+00:00 1 Answers 15 views 0

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  1. trungdung22
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    2021-08-23T07:01:29+00:00
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    Questions:

    (a) What is a simplified expression for (x + y) – (x – y)?

    (b) Carlotta thinks that 3y + 5y^3 is the same as 8y^4. Which statement shows that it is NOT the same?

    Answer:

    (x + y) - (x - y) =2y

    3y + 5y^3 \ne 8y^4

    Step-by-step explanation:

    Solving (a):

    Given

    (x + y) - (x - y)

    Required

    Simplify

    (x + y) - (x - y)

    Open brackets

    (x + y) - (x - y) = x + y - x + y

    Collect Like Terms

    (x + y) - (x - y) = x - x+ y + y

    (x + y) - (x - y) = y + y

    (x + y) - (x - y) =2y

    Solving (b):

    Given

    3y + 5y^3 and 8y^4

    Required

    Which expression shows they are not the same

    The expression that shows this is:

    3y + 5y^3 \ne 8y^4

    Take for instance; y=2

    Substitute 2 for y in 3y + 5y^3 \ne 8y^4

    3*2 + 5*2^3 \ne 8*2^4

    Evaluate all exponents

    9 + 5*8 \ne 8*16

    9 + 40 \ne 128

    49 \ne 128

    The above expression supports 3y + 5y^3 \ne 8y^4

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