How do you solve with the elimination method??

Mathematics

1 answer:

tensa zangetsu [6.8K]3 years ago

3 0

Answer: 2=x

Step-by-step explanation: -x+3 = 2x + 1 , 2 = x

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Find the roots of the quadratic equation x^2 – 8x = 9 by completing the square. Show your work.

loris [4]

X² - 8x = 9
x² - 8x - 9 = 0
x² + x - 9x - 9 = 0
x(x + 1) -9(x + 1) = 0
(x+1)(x-9) = 0
x = -1 or 9

In short, Your Answers would be -1 & 9

Hope this helps!

3 0

3 years ago

Carry out the following operations, and express the answer with the appropriate number of significant figures:

inn [45]

I don't understand your question

6 0

4 years ago

NEED HELP ASAP!! I have no idea how to complete the problem I just get that the answer is no solution

True [87]

Well since we can use a base of 1 we know that 1 - 45 is less than 4 but -1 + 45 is not, which follows the assumption that x>0, but now we need to know what x is less than to fit the inequality. If we use 5 as a trial we can see that 5 - 9 = -4 so 0<x<5 is your answer. Hope this helps I basically used trial and error. If you want to check try 3 or 4 for x and it will work but 6 will not.

4 0

3 years ago

What is the area of the rectangle?

Molodets [167]

Answer:

Step-by-step explanation:

Please look at the attached picture for full solution.

Method 1 is using the shoelace method to find the area of the rectangle. Shoelace method can be used to find the areas of any polygons given their coordinates. The coordinates have to be taken in an anticlockwise order and ending with the first coordinate.

Method 2 is making use of the distance formula of two points. The formula is as shown below:

$\sqrt{(x1 - x2) ^{2} + (y1 - y2)^{2} }$