<em>Presuming you mean y = -2x^2 - 8x - 13</em>
Firstly, put the x terms in parentheses and factor out -2:
![y=-2(x^2+4x)-13](https://tex.z-dn.net/?f=%20y%3D-2%28x%5E2%2B4x%29-13%20)
Next, we want to make what's inside those parentheses a perfect square. To do this, divide the x coefficient by 2 and square that result. In this case, that result is 4. Add 4 to the inside of the parentheses, and add 8 to the outside of the parentheses to balance it out. (Since when foiled, 4 x -2 = -8)
![y=-2(x^2+4x+4)-13+8\\y=-2(x^2+4x+4)-5](https://tex.z-dn.net/?f=%20y%3D-2%28x%5E2%2B4x%2B4%29-13%2B8%5C%5Cy%3D-2%28x%5E2%2B4x%2B4%29-5%20)
Next, factor what's inside the parentheses, and <u>your final answer will be
</u>
Answer:
A) Mean = 135 Variance = 62 Standard Deviation = 8
Step-by-step explanation:
Given that :
Proportion (p) = 54%
Sample size (n) = 250
Using Normal approximation :
Mean = np
Mean = 250 * 0.54 = 135
Variance = npq ; q = 1 - p = 1 - 0.54 = 0.46
Variance = (250 * 0.54 * 0.46) = 62.1 = 62
Standard deviation = √variance = √62.1
Standard deviation = 7.8803553 = 8
Answer:
-29
Step-by-step explanation:
-5x^2-6y^2
substitute the x and y values
-5(1)^2-6(2)^2
-5-6*4
-5-24
-29