All categories

3 years ago

I don't understand this at all...please help

Mathematics

2 answers:

umka21 [38]3 years ago

5 0

Answer:

Step-by-step explanation:

This is from the definition of an inverse matrix. Always will be 1 when multiplied.

zavuch27 [327]3 years ago

3 0

Answer:

Step-by-step explanation:

You might be interested in

Use the quadratic formula to solve the equation <br> 25x^2-30x+25=0

Reika [66]

Answer: $x=\frac{3}{5}+i\frac{4}{5},\:x=\frac{3}{5}-i\frac{4}{5}$

Step-by-step explanation:

$25x^2-30x+25=0$

$x_{1,\:2}=\frac{-\left(-30\right)\pm \sqrt{\left(-30\right)^2-4\cdot \:25\cdot \:25}}{2\cdot \:25}$

$\sqrt{\left(-30\right)^2-4\cdot \:25\cdot \:25}$

$=\sqrt{30^2-4\cdot \:25\cdot \:25}$

$=\sqrt{30^2-2500}$

$=i\sqrt{2500-30^2}$

$=40i$

$x_{1,\:2}=\frac{-\left(-30\right)\pm \:40i}{2\cdot \:25}$

$x_1=\frac{-\left(-30\right)+40i}{2\cdot \:25},\:x_2=\frac{-\left(-30\right)-40i}{2\cdot \:25}$

$x=\frac{3}{5}+i\frac{4}{5},\:x=\frac{3}{5}-i\frac{4}{5}$

8 0

3 years ago

Find the mean of the numbers<br> 1, -3, -10<br> -15, 4, -22<br> -7.5, 3, -6.5

Travka [436]

Answer:

13. -4 14. -11 15. $-\frac{11}{3}$

Step-by-step explanation:

13. (1-3-10)/3

14. (-15+4-22)/3

15. (-7.5+3-6.5)/3

5 0

3 years ago

Read 2 more answers

Find the missing Angle.

mylen [45]

The answer is 40 degrees

7 0

3 years ago

Read 2 more answers

The greater of two consecutive even integers is 20 more than twice the smaller. find the integers

Sliva [168]

9514 1404 393

Answer:

-19, -18

Step-by-step explanation:

Let x represent the smaller integer. Then the larger is x+1 and their relationship is ...

x +1 = 20 + 2x

-19 = x . . . . . . . . . subtract x+20 from both sides.

The smaller integer is -19; the larger is -18.

4 0

3 years ago

Luis does chores at home to earn extra money. Each week he earns $20. He already has $320 in his savings account, and is trying

Setler [38]

Answer:

30.5 Weeks

Step-by-step explanation:

The phone costs $930, and he already has $320 saved in his bank account so subtract 320 from 930. You will get 610. Then, you take 610 and divide it by 20 because he earns $20 a week. I hope this helped.

8 0

3 years ago