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1 answer:
Answer:
The digits are 37 (Thirty seven).
Step-by-step explanation:
Given:
Two digit number.
Let the unit place digit be y
and
The tens place digit be (y - 4) as it is 4 less than the unit digit.
So the two digit number is (y-4)(y).
According to question:
Seven times the tens digit plus five times the units digit is equal to 56.
⇒
⇒
⇒ ... both sides subtarcting with 28
⇒
⇒ ...both sides dividing with 12
So the ones place digit is and tens place digit is
The number can be arranged as, from right side we have to put the unit digit and then the tens place digit.
So the digits are 37 in arranged order fulfilling our criteria.
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Answer:
D. 2(√{x} + √{x - 2})
Step-by-step explanation:
As hinted in the question, we have to simplify the denominator.
To understand it easier, let's imagine we have x - y in the denominator. If we multiply it with x + y we'll get x² - y², right? Check the next line:
(x - y) (x + y) = x² + xy -xy - y² = x² - y²
If we have the square of those nasty square roots, it will be much simpler to deal with. So, let's multiply the initial fraction using x+y, but with the real values:
Then we simplify:
Answer is D. 2(√{x} + √{x - 2})