Answer:
x = 2 ± (i)√5 (Answer b)
Step-by-step explanation:
x²-4x+9=0 can be solved in a variety of ways; the first two that come to mind that are also appropriate are (1) completing the square and (2) using the quadratic formula.
Completing the square is fast here:
Rewrite x²-4x+9=0 as x²-4x +9=0
Identify the coefficient of the x term: it is -4
Take half of that, obtaining -2
Square this result, obtaining 4
Add 4 to x²-4x +9=0, in the blank space in the middle, and then subtract 4: x²-4x +4 -4 +9=0
Rewrite x²-4x +4 as the square of a binomial:
(x - 2)² - 4 + 9 = 0 → (x - 2)² = -5
Take the square root of both sides: x - 2 = ±√(-5) = ± (i)√5
Then x = 2 ± (i)√5
Answer:
Between each pair of points are coordinates K(x1,y1) F(x2, y2)
Distance KF =sqrt( (x2 - x1) ² + (y2 - y1) ²)
Step-by-step explanation:
The answer to your Q is 4
Answer:
I think it is 8, i did not learn this in school
Step-by-step explanation:
2(3x^2+5)
6x^2+10
.4 as a percentage is 40%
