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1 year ago

Solve: -2 < 5 - 2x < 2

Mathematics

1 answer:

dybincka [34]1 year ago

8 0

Answer:

-2 < 5 - 2x < 2

-7 < - 2x < -3

7/2 > x > 3/2

3.5 > x > 1.5

1.5 < x < 3.5

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Answer:

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

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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

$9 + 5*8 \ne 8*16$

$9 + 40 \ne 128$

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