Question

If Tn=3n²-20
answer of this equation
​

Answer 1

Answer:

27ans

Step-by-step explanation:

n=1

3×1-20

3-20

27

Answer 2

To solve this equation, you could just use guess-and-check. You would just guess at values of X and keep changing your guess until you got the right answer. But this takes a lot of time! Here's a better way:

Remember in the second grade when your teacher asked you to fill in the box in a problem like this:

4 +6= 10In algebra all we do is use a letter, like "X" instead of a box:

4 + X = 10

This equation asks you: What number equals 10 when you add 4 to it?

The answer to this question is 6, because 4 + 6 = 10.

Here are some simple equations:EquationThe question it asksThe

answerReasonX + 5 = 15If you add 5 to my number you get 15. What is my number?X = 10Because

10 + 5 = 15X - 13 = 13If you subtract 13 from my number you get 13. What is my number?X = 26Because

26 - 13 = 133X = 18If you multiply my number by 3, you get 18. What is my number?X = 6Because

3 times 6 = 18X/4 = 5If you divide my number by 4, you get 5. What is my number?X = 20Because

20/4 = 5

How about something more complex, like this equation:

2X - 5 = 11

Here's how you solve an equation of this type:

Cover up the "2x" with your finger (I'll use a box): - 5 = 11

Now solve for the value of the "box":= 16 because 16 - 5 = 11

Now look at what is in the 2× 8 = 16

Now solve the above easy equation:

X = 8, because 8 times 2 = 16

Here are some other equations, and how you would solve them:EquationStep 1:

Cover up the term

with X in itStep 2:

Solve for the boxed termStep 3:

Look at what's in the box and solve for it3X + 1 = 7 = 6

because 6 + 1 = 7X = 2, because

3 times 2 = 6X/2 - 1 = 3 = 4

because 4 - 1 = 3X = 8, because