x = –5

x = –25

x = 5 or –5

no solution

x = 5 or –5

Step-by-step explanation:

x^2        25

=

x+5       x+5

Using cross products

x^2 (x+5) = 25 (x+5)

Divide each side by (x+5)

x^2 (x+5)/(x+5) = 25 (x+5)/(x+5)

x^2 = 25

Take the square root of each side

sqrt(x^2) = ±sqrt(25)

x = ±5

No

Step-by-step explanation: The set of counting numbers {1, 2, 3, 4, ...} is called the set of natural numbers. The natural numbers begin with 1 and go on indefinitely.

Decimals are not natural numbers unless they have a 0 after the decimal point that repeats. However, 2.8 does not so it's not natural.