Answer:
f(x) = [x – (4 + √20)][x – (4 – √20]
Step-by-step explanation:
In order to know the function that best describes the given f(x) that best reveals it's minimum or maximum, we need to know solve for x.
x² – 8x – 4 = 0
Using completing the square method
x² – 8x = 4
x² – 8x + 4² = 4 + 4²
(x – 4)² = 20
x = 4 ±√20
Therefore
f(x) = [x – (4 + √20)][x – (4 – √20]
Pyhtaorean theorem says a² + b² = c²
a² + 7² = 25²
a² + 49 = 625; subtract 49 from both sides
a² = 576; square root both sides
a = 24
The perimeter is the distance around the figure, so 7 + 24 + 25 or 56
Answer:
25
Step-by-step explanation:
25 has 2 digits
25 is less than 30
25 is odd
2+5 = 7
It is 25.
Answer:
x = -1
Step-by-step explanation:
3x - 5 = - 8 (6 + 5x)
3x - 5 = - 48 - 40x
3x + 40x = - 48 + 5
43x = - 43
x = - 43/43
x = - 1
