Ricardo is draining his pool for the winter. There are 240 gallons in the pool and it is decreasing at a rate of 20 gallons per hour. Write an equation to represent the relationship between the amount of water in the pool,y, and the number of hours in the pool has been draining,x

Answer:

x = - 2 or x = - 8

Step-by-step explanation:

Given

2(x² + 10x) = - 32 ( divide both sides by 2 )

x² + 10x = - 16

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(5)x + 25 = - 16 + 25

(x + 5)² = 9 ( take the square root of both sides )

x + 5 = ± = ± 3 ( subtract 5 from both sides )

x = - 5 ± 3, thus

x = - 5 + 3 = - 2 or x = - 5 - 3 = - 8

The number 7 times 7 will be equal to 49.

What is an expression?

The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.

Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.

Given that there is the number 49. The number is the multiple of two numbers.

The product of the two numbers equal to 49 will be calculated as:-

E = 7 x 7'

E = 49

Therefore, the two numbers will be 7 and 7 whose product is equal to 49.

To know more about an expression follow

brainly.com/question/66244

#SPJ5