3 years ago

Which number is irrational? A. 25 B. 0.636363... C. 0.45 D. 6

Mathematics

1 answer:

Tresset [83]3 years ago

5 0

Answer:

Step-by-step explanation:

The "..." at the end of B tell us that it's a repeating decimal so B is irrational. Of course, you can't use this reasoning for every repeating decimal but in this case it works.

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a - b2

Step-by-step explanation:

STEP 1 :

Trying to factor as a Difference of Squares:

1.1 Factoring: a-b2

Theory : A difference of two perfect squares, A2 - B2 can be factored into (A+B) • (A-B)

Proof : (A+B) • (A-B) =

A2 - AB + BA - B2 =

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Note : AB = BA is the commutative property of multiplication.

Note : - AB + AB equals zero and is therefore eliminated from the expression.

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Final result :

a - b2

HOPE THIS HELPS!

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