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cestrela7 [59]
3 years ago
7

How many x-intercepts does the graph of y = 2x2 - 8x + 5 have?

Mathematics
1 answer:
Katyanochek1 [597]3 years ago
7 0

Answer:

Step-by-step explanation:

hello :

the  x-intercepts when : y=0  means : 2x²--8x+5 =0

∆ = b² -4ac     a=2  and b= -8 and c= 5

∆ = (-8)² -4(2)(5) = 64-40 =24

∆ >0 this equation has two solutions    so :  two x-intercepts

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Lets begin with an example.

You have 100 apples. 40 % of your apples are 40. Sounds complicated?

Here is the calculation in words, number of apples times 40 percentage.

By equation: 100 * 40/100= 40. Simple huh?

% symbol represents 100. 
% 15 equals 15/100; 20% is equal to 20/100 or 1/5 in a simplified way.

Have a look to question. 40 iris at last year, 15 % MORE iris this year.

What is the 15 % of 40 iris? That's the question at the end.

Recall apple example at the beginning.

40 iris * 15/100 = 6.

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Answer:

<h2>x = 20.8</h2><h2>y = 22.3</h2>

Step-by-step explanation:

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Since the opposite side is given and we need to find the length of the adjacent side, we can use tangent to solve for x.

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3 years ago
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tangare [24]

Answer:

Part a) The total volume is 98\ ft^{3}

Part b) 84\ ft^{3}

Step-by-step explanation:

Part a)

Find the total volume

we know that

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V=LWH

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L=3\frac{1}{2}\ ft=\frac{3*2+1}{2}=\frac{7}{2}\ ft

W=3\frac{1}{2}\ ft=\frac{3*2+1}{2}=\frac{7}{2}\ ft

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substitute in the formula

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Multiply the total volume by 6/7

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98(6/7)=84\ ft^{3}

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