4. a .Prayer
b. greetings
c .checking of attendance
Be a STAR!
*S -Stay Focused.
*T- Try to Learn.
*A -Answer questions.
* Raise your hand when you
want to speak.
5. TASK 1 –Tell whether if it ,is a mathematical expression or Not..
1. x + 12 6. 3Y + 5
4 Y+1
2. b² 7. X² + 3
b+2 4- X-³
3. X-√𝑦 8. 3Y_
√𝟓𝒙
4. x² 9. X+3
x-1 x²-9
5. 5x 10. 3X
3x 2X-Y
Question:
*What is Mathematical expression?
Is an expression is made up of a combination of numbers and variables
and operation symbols.
6. Our lesson for today is about rational
algebraic expressions?
A quotient expressed as a ratio is an
algebraic expression, specifically called
a rational algebraic expression. A
number which is quotient of integers is
said to be rational.
x-5 -----numerator
x+2 -----denominator
7. Activity1 –Pair Appear!
Below are list of expressions grouped into column. Pair the
given expression. In column A column B, to form a ratio of two
expressions.
Column A Column B Column A
B
1. 6x x -3
2. y²-1 2y³-2
3. 2n+1 m²+n-2
𝟒. 𝟑𝒚 5z
5. 𝟐𝒙𝟐
+ 𝟐 x - 6
Group I-2 Answer the Activity 1
x-6
8. Activity 2-Classify Me!
Classify the different expressions below into rational
algebraic expression or not rational algebraic expressions.
1. x² 6. x²__
x-1 5 – 11
2. 3xy² 7. 2m-n
7y+8 0-7
3. 2x²-y 8. a
0(-5) 3+b
4. x 9. 2m
4 n²-n²
5. 2-x 10. 3xy
3 -7+7
Group 3-4 Answer the Activity 2
9. 1. How did you find the activity?
* It is very interesting and educational.
2. How do you classify a rational algebraic expression from a
not rational algebraic expression?
* A rational expression is simply quotient of two
polynomials or in other words it is a fraction whose
numerator and denominator are polynomials. A ratio of
two polynomials.
The teacher will give a short discussion about the rational algebraic
expressions.
A Rational Algebraic Expressions is the ratio of two
polynomials provided that the numerator is equal to zero. In symbols
P/Q, where P and Q are polynomials, Q≠0.
What will happen when the denominator of a fraction becomes
zero? If the value of the denominator is zero, the fraction
value should be undefined.
Questions:
10. Each group illustrate and determine the given
expressions.
Find the values of the following expression that
make the expressions undefined.
Answers:
1. 18n+1 = 3. 7 =
n²+ n- 2 x² -16
2. -6 = 4. 3n -2 =
n²+n-2 9n²-12n+4
Generalization: A rational algebraic expression is
ratio of two polynomials provided that the
denominator is not equal to zero.
11. Instruction: Select the letter of the correct answer: (underline)
1.Which one is NOT a rational number? Answers:
a.4/1 b.1/3 c. 3𝐴 𝑑. 0.3 1. c
2.Jane has more than 10 medals and John has x medals ,what its mathematical expressions?
a.1/2 b.-1/2 c. m+10 d. m-10 2. c
3.Which of the ff. expression is a rational expressions?
a.
3
2𝑎𝑏
b. 2c- 2𝑎 c. 4y +z-2 d. a-b/2a+b 3. d
4.what mathematical expression ,if the product of p and q is divided by three.
a. pq/3 b. p+q/3 c. 3/pq d. p-q/3 4. a
5.what rational algebraic expression is the same as x²-1/x-1?
a.a+1 b. x-3 c. x/3 d. 3/x 5. a
6. which of the ff. terms is to described as the ratio of two polynomials expression?
a. linear b. linear equation c. rational algebraic expression d. none
6.c
7.In a rational algebraic expression can be written in the form P/Q, where P & Q are polynomials
,the polynomial Q must not equal to---.
a.-1 b. 0 c. 1 d. 2 7.b
8.which of the ff. is rational algebraic expression?
a. 3n²/n b. 3n¾/n c. 3n√𝑛 d. 3n/n-2 8. a
9.For what value of n will make the expression be undefined?
a. -12 b. -3 c. 3 d. 12 9. a
10.For what value of x will make the expression x+1/x²-6x +5 undefined?
a. -1 & -5 b. -1 & 5 c. 1 & -5 d. 1 & 5 10. d
