Answer:
x = -3, 6
Step-by-step explanation:
First, add 18 to both sides
x² - 3x - 18 = 0
+ 18 + 18
x² - 3x = 18
Add 9/4 to both sides because that is the square of half of -3
x² - 3x + 9/4 = 18 + 9/4
Multiply both sides by 4 to get rid of the fractions
(x² - 3x + 9/4 = 18 + 9/4)4
4x² - 12x + 9 = 72 + 9 = 81
Factor the left side of the equation
(2x - 3)² = 81
√(2x - 3)² = √81
Because of the square root, this will result in a positive number and a negative number
2x - 3 = 9
2x - 3 = -9
For both equations, add 3 to both sides then divide by 2
2x - 3 = 9
+ 3 +3
2x = 12
2x/2 = 12/2
x = 6
2x - 3 = -9
+ 3 + 3
2x = -6
x = -3
Answer:
-36.5
Step-by-step explanation:
substitute 8.5 for v
8-(6(8.5)+2-(8.5))
8-(51+2-8.5)
8-44.5
edited cause I forgot the 8 at first :P
Answer:
D) 31 child tickets and 49 adult tickets
Step-by-step explanation:
Answer:
14
Step-by-step explanation:
4÷2=2 he mows 2 lawns every hour so 7×2-14
Answer:
A = 5x^2 + 10x
Step-by-step explanation:
A = H*W
H = 5x
W = x + 2
A = 5x(x + 2)
Distribute
5x*x = 5x^2
5x*2 = 10x
A = 5x^2 + 10x
