is the formula for calculating x1 and x2
To prove x1 + x2 = -b/a all we need to do is to express x1 and x2 from equation above
once we do we will get -2b/2a which is equal to -b/a because square root part will negate each other. one has + sign in front and other - sign
Showing that x1x2 = c/a goes similar way.
the numerator parts is actually difference of squares. after that we will have:
-b^2 -b^2 + 4ac = 4ac
in denominator we have 2a*2a = 4a^2
4ac/4aa = c/a
Get as close to the perfect square, which you should have memorized. then divide the number by the perfect square. average the answers (perfect square and quotient) by adding them and diving by 2
Answer:
None of the above
Step-by-step explanation:
The general equation for volume is length times hight times width, so the volume should be 40cm.
Answer:
Margin of error = 0.475
Step-by-step explanation:
Given that,
Confidence level, C = 0.95
Sample size, n = 100
Population standard deviation, 
When the confidence level is 0.95, the value of 
The margin of error is given by :
So, the margin of error is 0.475.
Answer:
Divide her answer by -6 and see if her result is -108
Step-by-step explanation:
x ÷ -6 = -108
if not then the answer would be wrong
