Step-by-step explanation:
Btw The one on the upper right hand side is Right angle
12x > 9(2x - 3) -15
12x > 9*2x - 3*9 - 15
12x > 18x - 27 - 15
12x > 18x - 42
12x - 18x > -42
-6x > - 42 Divide both sides by -6 and the sign changes
x < -42/-6
x < 7
I hope this helps.
Answer:
B
Step-by-step explanation:
Given
4x² - 72x = 0 ← factor out 4 from each term
4(x² - 18x) = 0
To complete the square
add/subtract (half the coefficient of the x- term)² to x² - 18x
4(x² + 2(- 9)x + 81 - 81) = 0
4(x - 9)² - 4(81) = 0
4(x - 9)² - 324 = 0 ( add 324 to both sides )
4(x - 9)² = 324 ( divide both sides by 4 )
(x - 9)² = 81 ( take the square root of both sides )
x - 9 = ± = ± 9 ( add 9 to both sides )
x = 9 ± 9
Then
x = 9 - 9 = 0
x = 9 + 9 = 18
A good equation would be: f(<em>x</em>)=<em>P</em>(<em>r</em>)^(15). The full equation would be f(<em>x</em>)=<em>P</em>(<em>r</em>/1)^(1(15)), but I just simplified it. <em>P</em> is the initial/principal population of the snails, and <em>r</em> is the yearly rate of growth.