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Tema [17]
3 years ago
14

Quadratic formula to find the zeros b^2-4b+4=0

Mathematics
1 answer:
Lunna [17]3 years ago
5 0

Answer:

Step-by-step explanation:

Remark

I don't think you need the quadratic formula for this equation. It just factors into (b - 2)(b - 2), but I'll do it because you requested it.

Formula

\text{x = }\dfrac{ -b \pm \sqrt{b^{2} - 4ac } }{2a}

Givens

a = 1

b = - 4

c = 4

Solution

x = - - 4 +/- sqrt((-4^2) - 4*1*4)

       ====================

                   2*1

x = 4 +/- sqrt (16 - 16)

          ==========

              2

x = 4/2

x = 2

There are 2 roots but both of them are the same. Some teachers say there is only 1 root. I'm in that group.

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Step-by-step explanation:

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3 years ago
A car that sold for $11,900 has a sales tax of $767. How
dlinn [17]

Answer: 9,953

Step-by-step explanation:

The first step is to find what the sales tax rate is for the first car because it will be the same for the second.

11,900/767 = .064

Now to find the cost of the second car we divide.

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4 0
2 years ago
Six more than five times a number x is at least twenty one
LUCKY_DIMON [66]
5x3=15. 15+6=21. The answer would be 3
8 0
3 years ago
For f(x)=1/x^2-3, find<br> a) f(3)<br> b) f(2+h)<br> Show/explain work
valentina_108 [34]

f(x)=\dfrac{1}{x^2-3}\\\\a)\ f(3)\to\text{put x=3 to the equation of the function f}\\\\f(3)=\dfrac{1}{3^2-3}=\dfrac{1}{9-3}=\dfrac{1}{6}\\\\Answer:\ \boxed{f(3)=\dfrac{1}{6}}\\\\b)\ f(2+h)\to\text{put x=2+h to the equation of a function f}\\\\f(2+h)=\dfrac{1}{(2+h)^2-3}\ \ \ |\text{use}\ (a+b)^2=a^2+2ab+b^2\\\\=\dfrac{1}{2^2+2(2)(h)+h^2-3}=\dfrac{1}{4+4h+h^2-3}=\dfrac{1}{h^2+4h+1}\\\\Answer:\ \boxed{f(2+h)=\dfrac{1}{h^2+4h+1}}

6 0
3 years ago
Need help with this
nydimaria [60]

Answer:

The median is 36.8

Step-by-step explanation:

The median is the middle number in an ordered list.

We have to sort the list in increasing or decreasing order

5.9, 11.2, 13.9, 16.6, 22.9, 36.8, 43.1, 43.7, 44.2, 45.1, 49\\

Now we can remove the first and last numbers in each iteration until we get to the median

11.2, 13.9, 16.6, 22.9, 36.8, 43.1, 43.7, 44.2, 45.1\\13.9, 16.6, 22.9,36.8, 43.1, 43.7, 44.2\\16.6, 22.9, 36.8,43.1, 43.7\\22.9, 36.8, 43.1

36.8

4 0
3 years ago
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