X + y = 20
xy = -3
x + y = 20
x - x + y = -x + 20
y = -x + 20
xy = -3
x(-x + 20) = -3
x(-x) + x(20) = -3
-x² + 20x = -3
-x² + 20x + 3 = 0
-1(x²) - 1(-20x) - 1(-3) = 0
-1(x² - 20x - 3) = 0
-1 -1
x² - 20x - 3 = 0
x = -(-20) ± √((-20)² - 4(1)(-3))
2(1)
x = 20 ± √(400 + 12)
2
x = 20 ± √(412)
2
x = 20 ± 2√(103)
2
x = 10 ± √(103)
x = 10 + √(103) or x = 10 - √(103)
x + y = 20
10 + √(103) + y = 20
- (10 + √(103)) - (10 + √(103))
y = 10 - √(103)
(x, y) = (10 + √(103), 10 - √(103))
or
x + y = 20
10 - √(103) + y = 20
- (10 - √(103)) - (10 - √(103))
y = 10 + √(103)
(x, y) = (10 - √(103), 10 + √(103))
The two numbers that add up to 20 and multiply to -3 are 10 ± √(103).
Answer:
Step-by-step explanation:
SP = CP + markup
- 155 + 30% =
- 155*1.3 =
- 201.50
It would be 4 radical 2^5. you can take two groups of 2 out. then it becomes 4x2^2 radical 2 because you still have one left under the radical. then it =4x4 radical 2 =16 radical 2. so after all that the equation is 6 radical 2 + 16 radical 2 and your final answer is 22 radical 2
A larger error variance making it difficult to estimate the partial effect of any of the independent variables on the dependent variable is True.
<h3>What is Variance?</h3>
This is used to measure how far a data is spread out and the effect independent variables has on the dependent ones.
When there is an error in the variance, the effect calculated is inaccurate which brings about difficulty in ascertaining it.
Read more about Variance here brainly.com/question/15707019
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A. They need to be sure you will be able to pay the loan back