Answer:
k=2
Problem:
if the equation x^2 +(k+2)x+2k=0 has equal roots,then the value of k is ..
Step-by-step explanation:
Since the coefficient of x^2 is 1, we can use this identity to aid us: x^2+bx+(b/2)^2=(x+b/2)^2.
So we want the following:
[(k+2)/2]^2=2k
Apply the power on the left:
(k+2)^2/4=2k
Multiply both sides by 4:
(k+2)^2=8k
Expand left side:
k^2+4k+4=8k *I used identity (x+c)^2=x^2+2xc+c^2
Subtract 8k on both sides:
k^2-4k+4=0
Factor using the identity mentioned a couple lines above:
(k-2)^2=0
Since zero squared is zero, we want k-2=0.
Adding both sides by 2 gives k=2.
5+5= 10
10 time 9b is 90b
10 times -7 is -70
Then 90b-70
Answer:
−9.3x + 13.1y
Step-by-step explanation:
Answer:
1.) What is the difference between the proportion of women with high blood pressure who use oral contraceptive and those who don't?
2.) P1 - P2
3.)
Let P` = population statistic
P1` - P2`
Step-by-step explanation:
Since the experiment is to know if there is a difference between high blood pressure in women who use oral contraceptives or not ; the we can frame the research question thus :
What is the difference between the proportion of women with high blood pressure who use oral contraceptive and those who don't?
2.) P1 - P2
P1 = All women who have high blood pressure and use oral contraceptive
P2 = All women who high blood pressure who don't use oral contraceptive
3.)
P1` - P2` ; (0.15 - 0.10)
P1` = women in the sample (900) who have high blood pressure and use oral contraceptive
P2` = women in the sample (900) who high blood pressure who don't use oral contraceptive
