answersLogoWhite

Top Answer
User Avatar
Wiki User
Answered 2013-04-25 00:14:49

If you have:x-2And you know that x=6...... then you can "substitute" 6 for x:6-2=4

Example 1: If x=5 then what is 10/x + 4 ?

Put "5" where "x" is:

10/5 + 4 = 2 + 4 = 6

Example 2: If x=3 and y=4, then what is x2 + xy?

Put "3" where "x" is, and "4" where "y" is:

32 + 3×4 = 3×3 + 12 = 21

Example 3: If x=3 (but you don't know "y"), then what is x2 + xy ?

Put "3" where "x" is:

32 + 3y = 9 + 3y

(that is as far as you can get)

As that last example showed, you may not always get a number for an answer, sometimes just a simpler formula.

Negative NumbersWhen substituting negative numbers, put () around them so you get the calculations right.

Example 4: If x = -2, then what is 1-x+x2?

Put "(-2)" where "x" is:

1 - (-2) + (-2)2 = 1 + 2 + 4 = 7

Note: if you don't know why

  • the - (-2) became +2 or
  • the (-2)2 became +4

then here is a quick summary: RuleAdding or SubtractingMultiplying or DividingTwo like signs become a positive sign3+(+2) = 3 + 2 = 53 × 2 = 66-(-3) = 6 + 3 = 9(-3) × (-2) = 6Two unlike signs become a negative sign7+(-2) = 7 - 2 = 53 × (-2) = -6 (-3) × 2 = -68-(+2) = 8 - 2 = 6

001
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0
User Avatar

Your Answer

Still Have Questions?

Related Questions

How do you solve an or problem if a variable is unrestricted in sign?

Solve the problem using the + sign for the variable. Then solve the problem using the - sign for the variable. Report your answer as the answer that you got using + or the answer that you got using -.


Can you give me a sentence using solve?

We can solve the mystery.


How do you solve math?

by using a calculator


How do you solve 3 dimensional equations?

You can solve the system of equations with three variables using the substitute method, or using matrix operations.


How is control flow used to solve problems using computer programming?

How is control flow used to solve problems using computer programming


How do you solve cumulative problems?

by using a calculator


How does using a simple machine solve problems?

Using simple machines like pulleys, levers, etc. Solve problems because chickens use Pottys


How do you solve an equation using addition?

Addition and subtraction are inverse operations. So you can solve addition by subtracting.


How do you solve for a common solution in math?

by using your brain


How do you solve a problem using probability?

The answer depends on that the problem is!


How do you solve power factor?

by using capacitor & inductor


How do you solve Napier's rules?

By using The Napier's rule


When you construct and use a table to solve a problem?

When you construct and use a table to solve a problem, you are using a numerical approach.


How do you divide using place value to solve the problem?

you divide by using tens, hundreds, and thousands


How do you solve word problems using variables?

Use a variable to represent the unknown. 'Translate' the words to math symbols and write an equation to solve. Solve the equation. Check.


Solve problems using the order of operations?

Language of Algebra


How do you solve a linear equation using the symbolic method?

you cant


How do you find the angles of a triangle?

Measure them or solve for them using an equation.


How do you solve an equation using division?

Divide big # by little #.


How do you solve 239 by 47 using Napier's Bones?

11,233


What need or problem did the iron plow solve?

Using your hands


What does calculate means?

it means to work out or solve using math


How do you solve 0 equals x squared minus ten x plus 16?

Solve using the quadratic formula


What is a disadvantage to using tables?

It is often difficult to solve complicated problems using tables or graphs alone.


How do scientists come up with hypotheses?

They get a problemand then try to solve it .Then comes the hypothesis that helps them solve the problem by using the steps of the hypothesis.


Still have questions?