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stealth61 [152]
3 years ago
10

Consider the problem of finding the line of symmetry and vertex of the quadratic equation f(x) =x^2-8x+15 What is the error in t

he solution below?
x^2-8x+15=0 x=-8/2 =-8/2=-4 line of symmetry
8^2-8x+15=0 (-4)^2-8(-4)+15=0
16+32+15=0 y=63
(-4,63) vertex
A. The solution is correct.
B. The line of symmetry should have been 4 instead of –4.
C. The vertex is incorrect; it should have been {–4, 53}.
D. -4^2 should have been squared as –16 instead of 16.
Mathematics
1 answer:
Darina [25.2K]3 years ago
3 0
It is between A or B sorry i cant help you any further..
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2 years ago
A rectangular swimming pool is twice as long as it is wide. A small concrete sidewalk surrounds the pool and is a constant 2 fee
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Answer:

The dimensions of the pool are:

Width: 8.944 feet

Length: 17.888 feet

Step-by-step explanation:

From Geometry, the area of a rectangle (A), measured in square feet, is determined by the following equations:

A = w\cdot l (1)

Where:

w - Width, measured in feet.

l - Length, measured in feet.

If we know that w = x, l = 2\cdot x and A = 160\,ft^{2}, then we get the following second order polynomial:

2\cdot x^{2}-160 = 0 (1)

And we solve the expression for x:

2\cdot x^{2} = 160

x^{2} = 80

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x \approx 8.944\,ft

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5 0
3 years ago
A rectangular garden has a length that is modeled by the expression 2x - 7 and a width of 3x^2+4x.
aleksandr82 [10.1K]

Answer:

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Step-by-step explanation:

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1. Gather your like terms

2. Gather you unlike terms

3. calculate

4. set equation up to find the answer

1.2x-3x^2+4x

2. 7•4

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3 0
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\bf 9^{\frac{1}{3}}\cdot 3^{\frac{1}{3}}\cdot x^{\frac{4}{3}}\cdot x^{\frac{8}{3}}\implies (3^2)^{\frac{1}{3}}\cdot 3^{\frac{1}{3}}\cdot x^{\frac{4}{3}+\frac{8}{3}}\implies 3^{\frac{2}{3}}\cdot 3^{\frac{1}{3}}\cdot x^{\frac{12}{3}} \\\\\\ 3^{\frac{2}{3}+\frac{1}{3}}x^4\implies 3^{\frac{3}{3}}x^4\implies 3x^4

6 0
4 years ago
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Answer:

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Step-by-step explanation:

7 0
4 years ago
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