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sammy [17]
3 years ago
10

Evaluate the expression when a= 2 and c=-4. -a +5c

Mathematics
1 answer:
-Dominant- [34]3 years ago
4 0
The answer would be 18
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X^2 - 2x = 15 how do I solve this quadratic method?<br>I am stuck on it.... please help<br>​
Anarel [89]

Answer:

(x - 5)(x + 3)

Step-by-step explanation:

to solve x² - 2x = 15, we need to get all the terms on one side so we can solve the quadratic equation using factoring. to do this, we subtract 15 from both sides

x² - 2x = 15

- 15         -15

x² - 2x - 15 = 0

now we can factor. we need 2 numbers that when multiplied together give us -15, and when those 2 numbers are added together we get -2

because we have a -15, we can assume that one number must be negative and the other positive, as a negative times a postive is a negative.

we can use 3 and -5 as factors and test it out. we put x in front because we have an x²

(x - 5)(x + 3) < we can FOIL to check to see if this is correct. its not mandatory to check but when you arent sure of the answer you can FOIL it out

FOIL stands for: First, Outside, Inside, and Last terms

F: (x - 5)(x + 3) = x²

O: (x - 5)(x + 3) = -3x

I: (x - 5)(x + 3) = 5x

L: (x - 5)(x + 3) = -15

x² + 3x - 5x - 15 < subtract 3x from 5x

x² - 2x - 15

this checks out, so our answer is (x - 5)(x + 3)

6 0
3 years ago
Read 2 more answers
HELP ME NEED TO SUBMIT IN 6 MINUTES<br> WILL MARK BRAINLIEST FOR CORRECT ANSWER
agasfer [191]

Answer:c

Step-by-step explanation:

6 0
3 years ago
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Solve the inequality |x| &lt; 5.
Nuetrik [128]
<h2>Hello!</h2>

The answer is:

{-5<x<5}

<h2>Why?</h2>

To solve the problem, we need to remember how Absolute Value Functions behave, when we have this type of function, related to an inequality, the solution will be between two values.

We are given the inequality:

|x|

So, we know that "x" will be between -5 and 5:

-5

Hence, the solution of the given inequality will be:

(-5,5) or {-5<x<5}

Have a nice day!

8 0
3 years ago
44 points, please answer this question ASAP!
Zigmanuir [339]
Add the 5 amounts:

-10 + -23 = -33

-33 + 8 + 7 + 3 = -15 cents
 now divide by the number of changes (5)


-15 / 5 = -3 cents
 the mean change is -3 cents

3 0
3 years ago
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Which fractions are equivalent to 0.61? S
sleet_krkn [62]

Answer:

61/100 61/1

Step-by-step explanation:

5 0
3 years ago
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