X² + 4x - 8 = 5
This is a simple quadratic equation. Let's move everything to the left side to start:
x² + 4x - 8 - 5 = 5 - 5
Now we have:
x² + 4x - 13 = 0
In a quadratic equation, x =
![\frac{-b +- \sqrt{b^{2} -4ac} }{2a}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-b%20%2B-%20%20%5Csqrt%7Bb%5E%7B2%7D%20-4ac%7D%20%7D%7B2a%7D%20)
Therefore, we plug in a = 1, b = 4, and c = -13, and we find that x = -2 - sqrt{17} OR -2 + sqrt{17}.
Answer:
36π inches
Step-by-step explanation:
Formula for the area of a circle is A = π r^2
Plug in 6 for r into the equation. A = π 6^2
A = 36π
y = kx for a proportional relationship
12 = k*5
divide each side by 5
12/5 = k
y = 12/5 x
if x=8
y = 12/5 * 8
y = 96/5
y = 19 1/5
Step-by-step explanation:
f(5) = 2(5 - 7) = 2(-2) = -4.