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3 years ago

Help me! I’ll.do anything

Mathematics

1 answer:

Anna71 [15]3 years ago

7 0

Answer:

whats the problem?

Step-by-step explanation:

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What is the discriminant of the polynomial 4x^2 - 20 x + 25 ?

Zarrin [17]

Hello from MrBillDoesMath!

Answer:

Discussion:

For the quadratic ax^2 + b^x + c, the discriminant is b^2 - 4ac. In our case, the discriminant is

(-20)^2 - 4 (4)(25) =

400 - 4 (100) =

(This means the polynomial has a duplicate root. In fact it factors as (2x-5)^2 ).

Thank you,

MrB

3 0

3 years ago

Read 2 more answers

The cost of a High Definition television now averages $700, but the cost is decreasing about 15% per year. In how many years wil

Roman55 [17]

Answer: 7.7 years

Step-by-step explanation:

Given

The cost of HD TV is $700 and it is decreasing at the rate of 15% per year

After one year it becomes

$\Rightarrow 700-700\times 15\%\\\Rightarrow 700(1-0.15)$

after 2 year it becomes

$\Rightarrow 700(1-0.15)-700(1-0.15)\times 15\%\\\Rightarrow 700(1-0.15)(1-0.15)\\\Rightarrow 700(1-0.15)^2$

Suppose, after x years it becomes $200

$\Rightarrow 200=700(1-0.15)^x\\\\\Rightarrow \dfrac{2}{7}=0.85^x\\\\\text{Taking log both sides}\\\\\Rightarrow x=\dfrac{\ln (\frac{2}{7})}{\ln (0.85)}\\\\\Rightarrow x=7.7\ \text{years}$

Thus, it takes 7.7 years for the cost to come under $200.

3 0

2 years ago

What does x equal? help pls c:

sweet-ann [11.9K]

Answer:

this question answer is 11

8 0

3 years ago

Find the value of x.

Artemon [7]

${5}^{2} + {x}^{2} = {8}^{2}$

$25 + {x}^{2} = 64$

Subtract both sides 25

$25 - 25 + {x}^{2} = 64 - 25$

${x}^{2} = 39$

Thus :

$x = \sqrt{39}$

$x = 6.245$

6 0

2 years ago

How<br> many<br> squares<br> are in this<br> figure?

Sophie [7]

Answer:

Step-by-step explanation:

Look at the picture.

7 0

3 years ago