Question

for what value of x ,2x × 5x ends in 5

Answer 1

Answer:No valve of x

Step-by-step explanation:

(2x)(5x) if you multiply it you will get 10^x²

We need the ending digit as 5 but we got 0 as our ending digit

Therefore, there is no valve of x.

☺️I HOPE IT IS HELPFUL YOU☺️

Answer 2

For x = 5, (2x * 5x) ends in 5.

Step-by-step explanation:

• The given expression is (2x * 5x). We have to determine the value of x, for which the earlier said expression ends in 5.

• We put x = 1. Then 21 * 51 ends in 1, since the ones digits are 1.

• In this way, we calculate upto x = 4.

• Now, when x = 5, 25 * 55 ends in 5, since the ones digits are 5. However, 25 * 55 = 1375, which ends in 5.

• For other values of x (6, 7, 8, 9 and 0), the results are not satisfactory.

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