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I am Lyosha [343]
3 years ago
10

Qual é o resultado da multiplicação a seguir:

Mathematics
1 answer:
earnstyle [38]3 years ago
4 0

Answer:

que????? no entiendo??????

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Can you help me with my work
andrezito [222]

Answer:

1. x = ±9

2. x=\pm \sqrt{13}

3. 12 and -12.

4. Antoine is incorrect. There exists two solutions x=5 and x= -5.

Step-by-step explanation:

According to the questions,

Problem 1. x^{2}-81=0 i.e. x^{2}=81 i.e. x = ±9.

Problem 2. 2x^{2}-26=0 i.e. x^{2}-13=0 i.e. x^{2}=13 i.e. x=\pm \sqrt{13}

Problem 3. [tex]f(x)=x^{2}-144[tex]

To find the roots, we take, [tex]x^{2}-144=0[tex] i.e. [tex]x^{2}=144[tex] i.e. x = ±12.

Thus, the options are 12 and -12.

Problem 4. We have [tex]f(x)=x^{2}+25[tex]

For the roots, we take, [tex]x^{2}+25=0[tex] i.e. [tex]x^{2}=25[tex] i.e. x = ±5.

Thus, Antoine is not correct and two solutions namely x=5 and x= -5 exists.

8 0
3 years ago
Anna drives 3.9 miles to work. Tanya drives 7.5 times farther to work than Anna drives.
nalin [4]

Answer:Tanya drives 11.4 miles farther.

Step-by-step explanation:

3.9+7.5=11.4 miles

4 0
2 years ago
Read 2 more answers
The function h(x) = x2 + 14x + 41 represents a parabola.
defon
Part A:

h(x)= x^{2} +14x+41

The first step of completing the square is writing the expression x^{2} +14x as (x+7)^{2} which expands to x^{2} +14x+49.

We have the first two terms exactly the same with the function we start with: x^{2} and 14x but we need to add/subtract from the last term, 49, to obtain 41. 

So the second step is to subtract -8 from the expression x^{2} +14x+49

The function in completing the square form is
h(x)= (x+7)^{2}-8

Part B:

The vertex is obtained by equating the expression in the bracket from part A to zero

x+7=0
x=-7

It means the curve has a turning point at x = -7

This vertex is a minimum since the function will make a U-shape. 
A quadratic function a x^{2} +bx+c can either make U-shape or ∩-shape depends on the value of the constant a that goes with x^{2}. When a is (+), the curve is U-shape. When a (-), the curve is ∩-shape

Part C:

The symmetry line of the curve will pass through the vertex, hence the symmetry line is x=-7

This function is shown in the diagram below




3 0
3 years ago
Read 2 more answers
Please help me please
Lerok [7]

Answer: circumference: 22π  area: 121π

Step-by-step explanation:

area of a circle is \pi r^2

circumference is 2\pi r

4 0
3 years ago
Find the value of x.<br> 5+x=7<br> x = [?]
Vikki [24]

Answer:

<h2><u><em>x = 2</em></u></h2>

Step-by-step explanation:

Find the value of x.

5+x=7

x = [?]

5 + x = 7

x = 7 - 5

<u><em>x = 2</em></u>

----------------check

5 + 2 = 7

7 = 7

the answer is good

5 0
2 years ago
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