Answer:
Step-by-step explanation:
(a + b)² =a² + 2ab + b²
(a -b)² = a² - 2ab + b²
1) y = (x -1)²
y= x² - 2*x*1 + 1
y = x² - 2x + 1
Ans: C
2)y = (x +4)² + 5
y = x² +2*x*4 + 4² + 5
= x² + 8x + 16 + 5
y = x² + 8x + 21
C
3) y = -(x + 9)²- 10
y = - [x² + 18x + 81] - 10
= -x² - 18x - 81 - 10
y =-x² - 18x - 91
B
4) y = 3(x + 2)² - 18
y =3 [x² + 4x + 4] - 18
y = 3x² + 12x + 12 - 18
y =3x² + 12x - 6
A
5) y = -2(x + 1)² - 16
= -2[x² + 2x + 1] -16
= -2x² - 4x - 2 - 16
y = -2x² - 4x - 18
A
6) y = 5(x + 5)²
=5[x²+ 10x + 25]
y = 5x² +50x + 125
A
7)y = (1/2)(x + 8)² - 8
y = (1/2) (x² + 16x + 64) - 8
![y = \dfrac{1}{2}*x^{2}+ \dfrac{1}{2}*16x + \dfrac{1}{2}*64 -8\\\\\\y =\dfrac{1}{2}x^{2}+8x +32 - 8\\\\\\y=\dfrac{1}{2}x^{2} +8x + 24](https://tex.z-dn.net/?f=y%20%3D%20%20%5Cdfrac%7B1%7D%7B2%7D%2Ax%5E%7B2%7D%2B%20%5Cdfrac%7B1%7D%7B2%7D%2A16x%20%20%2B%20%5Cdfrac%7B1%7D%7B2%7D%2A64%20-8%5C%5C%5C%5C%5C%5Cy%20%3D%5Cdfrac%7B1%7D%7B2%7Dx%5E%7B2%7D%2B8x%20%2B32%20-%208%5C%5C%5C%5C%5C%5Cy%3D%5Cdfrac%7B1%7D%7B2%7Dx%5E%7B2%7D%20%2B8x%20%2B%2024)
A
8) y = (x + 3/2)² + 3/4
![y = x^{2} +2*x*\dfrac{3}{2}+\dfrac{9}{4}+\dfrac{3}{4}\\\\y=x^{2}+3x+\dfrac{12}{4}\\\\\\y=x^{2}+3x + 3](https://tex.z-dn.net/?f=y%20%3D%20x%5E%7B2%7D%20%2B2%2Ax%2A%5Cdfrac%7B3%7D%7B2%7D%2B%5Cdfrac%7B9%7D%7B4%7D%2B%5Cdfrac%7B3%7D%7B4%7D%5C%5C%5C%5Cy%3Dx%5E%7B2%7D%2B3x%2B%5Cdfrac%7B12%7D%7B4%7D%5C%5C%5C%5C%5C%5Cy%3Dx%5E%7B2%7D%2B3x%20%2B%203)
C
9) y = 2[x² + 16x + 64] - 5x
y = 2x² + 32x + 64 - 5x
y =2x² + 27x + 6
Answer:
70 degrees
Step-by-step explanation:
180-120=60
180-(60+50)=70
Probably a ponytail or just your hair down.
Answer:
23,128.56 qt
Step-by-step explanation:
We need to add the conversion from L to qt:
1 L = 0.26 gal = 0.26(4 qt) = 1.04 qt
Multiplying by 22239 L, we have ...
22,239 L = 23,128.56 qt
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<em>Comment on the answer</em>
The conversion factor given is good for 2 significant digits, so the answer would be appropriately rounded to 23,000 qt. The real conversion is to 23,496.519025 quarts when rounded to 6 decimal places.