Simplify the expression -2(3x-9)

Mathematics

1 answer:

boyakko [2]3 years ago

4 0

Answer:

-6x+18

Step-by-step explanation:

you multiply -2 by the numbers in the bracket

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B. Determine the values of a and b so that f is continuous.<br><br> Please help!

wlad13 [49]

Answer:

following are the solution to this question:

Step-by-step explanation:

Please find the complete question in the attached file.

$\lim_{x\to 2}+f(x) = \lim_{x\to 2}+ (ax^2-bx+3) = 4a-2b+3\\\\ \to 4a-2b+3 = 4\\\\ \therefore \ \ 4a-2b = 1\\\\$

The one-sided limits of F(x) at x = 3 must be equivalent for f(x) to be continuous at x = 3.

$\to \lim_{x\to 3}- f(x) = \lim_{x\to 3}- (ax^2-bx+3) = 9a-3b+3\\\\ \to \lim_{x\to 3}+ f(x) = \lim_{x\to 3}+ (2x-a+b) = 6-a+b\\\\$

So,

$\to 9a-3b+3 = 6-a+b\\\\\therefore\\ \to 10a -4b = 3$

$\to 4a - 2b = 1......(a)\\\to 10a - 4b = 3.......(b)\\$

In equation a multiply the by -2 and then add in the equation b:

$\to -8a + 4b = -2\\\to 10a - 4b = 3\\ \to 2a = 1\\\\ \to a = \frac{1}{2}\\\\ \to \ 4(\frac{1}{2}) - 2b = 1\\\\ \to 2 - 2b = 1\\\\ \to -2b = -1\\\\ \to b = \frac{1}{2}$

So, the value of $a \ and \ b= \frac{1}{2}$

4 0

3 years ago

How can 3/7 divided by 2/4 be written in simplest form?

vova2212 [387]

Presenting your problem symbolically:

3
--
7

==== becomes
2
---
4

3
---
7

====

1
---
2

To divide by 1/2, multiply by 2/1:

3 2
-- * ---
7 1

Multiplying, we get 6/7.

5 0

4 years ago

What is 14 times 13 divided by 9 plus 8

AleksandrR [38]

As there are no parenthesis, Follow PEMDAS and go from left to right

14 x 13 = 182

182/9 = 20.22

20.22 + 8 = 28.22

28.22 is your answer

hope this helps

5 0

3 years ago