All categories

3 years ago

A classmate wrote the solution to the inequality |-4x + 1| > 3 as show below. Describe and correct the error.

Mathematics

1 answer:

andrezito [222]3 years ago

8 0

Answer:

See below.

Step-by-step explanation:

The last step is incorrect. When we divide both sides by a negative the inequality is flipped. The answer is x < -1/2.

Also they omitted the other possibility that the expression in the vertical lines could be negative.

We also have the inequality

- 4x + 1 < - 3

-4x < -4

x > 1.

You might be interested in

Mr. Jacob arrived at his school at 07:10 and left at 15:45. How long was he in his school?

Makovka662 [10]

Answer:

he stayed 8 hours and 35 minutes

Step-by-step explanation:

15 -7 =8

45-10=35

7 0

2 years ago

How do you graph y=-1/3x

givi [52]

Step-by-step explanation:

it is negative so the slope must go downwards from left to right. since it is 1/3, for every 3 to the right, you go one down.

4 0

2 years ago

The length of a rectangle is represented by the function L(x) = 5x. The width of that same rectangle is represented by the funct

IgorC [24]

A= l x w
5x * 2x^2 - 4x + 13
10x^3 - 20x^2 + 65x

3 0

3 years ago

Read 2 more answers

Use the quadratic formula to solve. Round to the nearest tenth if necessary.<br> 2x^2 -3x -7 = 0

abruzzese [7]

The quadratic formula is:

$\frac{-b + \sqrt{b^2 - 4ac} }{2a}$ and $\frac{-b - \sqrt{b^2 - 4ac} }{2a}$

In this case, a = 2, b = -3, and c = -7

So, we can plug in the numbers to get:

$\frac{-(-3) + \sqrt{(-3)^2 - 4(2)(-7)} }{2(2)}$ and $\frac{-(-3) - \sqrt{(-3)^2 - 4(2)(-7)} }{2(2)}$

Simplifying, we get:

$\frac{3 + \sqrt{65} }{4}$ and $\frac{3 - \sqrt{65} }{4}$

You need to use a calculator to find what these would be in decimal form. The answer, rounded to the nearest tenth, is: x = 2.8, x = -1.3

8 0

2 years ago

Plz help me well mark brainliest!

aleksley [76]

It’s -9 because when multiplied it’s about -9

4 0

2 years ago