Algebra - Substitution
Welcome Friends!
In
last blog we have seen the correct Order of Operation to solve the Algebra.
Today we are going to learn, the
substitution of particular value at unknown. Most of the time in mathematics we
have to check or find out the value of given unknown or variables in
expression, where we have to try this expression with some assumed value called
substitute. We are going to see it today.
So, “Substitute” means to put in place of another.
Substitution Means:
In
Algebra, it means to put numbers or some value in place of letters/ variables.
For example:
Some
More Examples:
(1)
When
x = 2, what is 10/x + 5?
Put ‘2’ where “x” is
10/2 + 5 = 5 + 5 = 10
(2)
When
x = 5, what is 4x + x/5
Put ‘5’ where “x”
is
4 x 5 + 5/5 = 20 +
1 = 21
(3)
If
x = 3 and y = 4, then what is x3 + xy?
Put ‘3’ where “x” is & ‘4’ where “y” is
33 + 3 x 4 = 27 + 12 = 39
When Substitute value is negative number
then?
When Substitute is negative number, then it is better to put it in ( ),
so you get calculation right.
For example:
(1)
If
x= -3, then what is x2 + x + 1 =?
Put “(-3)” where
“x” is
(-3)2 +
(-3) + 1 = 9 – 3 + 1
= 6 + 1
= 7
More
Examples for Practice:
1)
If
x = 1/2, then find x2 – x2 + 2 =?
2)
If
x = 5 then find 3x – x + 3
3)
If
x = 6, then find x/2 + 3
Thank you!
Hope you enjoyed it!!
Next Blog: Inequalities In Algebra.
Introduction to algebra ( Part I)
Introduction to Algebra (Part II) (Multiplication & Division)
Transposing Method of Solving Algebra
Order of Operations – BODMAS/PEMDAS
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