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Luba_88 [7]
4 years ago
11

How do you solve 2x2-10x-28=0

Mathematics
1 answer:
musickatia [10]4 years ago
7 0
2x^2-10x-28=0\ \ \ |:2\\\\x^2-5x-14=0\\\\x^2+2x-7x-14=0\\\\x(x+2)-7(x+2)=0\\\\(x+2)(x-7)=0\iff x+2=0\ \vee\ x-7=0\\\\\boxed{x=-2\ \vee\ x=7}
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A fifth-degree polynomial equation with rational coefficients has the roots 3, 8i, and 7- radical 5. Which are also roots of the
Sliva [168]

Using <u>complex numbers and radicals</u>, it is found that the correct option is C.

When a complex number is a root of a polynomial function, it's conjugate also has to be.

  • Hence, since 8i is a root of the function, -8i is also a root.

The same is valid for radicals, as they are in the \pm format.

  • Since 7 - \sqrt{5} is a root, 7 + \sqrt{5} is also a root.

Hence, option C is correct.

For more on <u>complex numbers and radicals</u>, you can check brainly.com/question/25173944

8 0
2 years ago
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Diano4ka-milaya [45]
There are two blue marbles so you have a 2/8 probability of drawing a blue marble on each draw since the marble is replaced after the first draw. 2/8 can be simplified to be 1/4 and then converted to be 0.25 per draw. 0.25 plus 0.25 equals 0.5. Since we are dealing with percentages multiply 0.5 x 100 which equals 50. Now take 50 and divided by the total number of marbles in the bag which is 8. 50 divided by 8 equals 6.25. So it would be about 6%.
8 0
4 years ago
Carmelo's height is 2.12 m. Express this measurement in millimeters. Explain your thinking.
Butoxors [25]

Answer:

2120 milimeters

Step-by-step explanation:

to convert meters to milimeters, you need to multiply your value by 1000, so in this case 2.12x 1000= 2120

Hope this helps

5 0
3 years ago
Choose the correct response​
lilavasa [31]

Answer:

f(2) = 9

Step-by-step explanation:

It's give in the question,

Two different functions are,

f(x) = 4x + 1

g(x) = -2x

Then we have to find the output value of function 'f' for the input value x = 2.

By substituting the value of x in the function 'f',

f(2) = 4(2) + 1

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f(2) = 9

5 0
3 years ago
What is the solution of the inequality |2x+3|≤7?
Allushta [10]
Assuming you want to solve for x the result can vary. The result can be shown in multiple forms. Hope this helps!

Inequality Form:
−5≤x≤2
Interval Notation:
[−5,2]
6 0
3 years ago
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