LESSON PLAN
School
Subject
Class
Semester
: SMA Negeri 1 Gelumbang
: Mathematics
:X
:1
Standard Competence :
2. Solving problems related to function, quadratic function and quadratic equation
as well as quadratic inequalities.
Basic Competence :
2.3 Using properties and rules of quadratic equation and inequality.
Indicators :

Find the formula of sum of roots of quadratic equation.

Find the formula of product of roots of quadratic equation.
Time: 10 minutes
A. Learning Objectives

Students are able to find the formula of sum of roots of quadratic equation.

Students are able to find the formula of product of roots of quadratic equation.
 Student’s Character
:
Discipline
respect
diligence
responsibility
B. Learning Contents
Quadratic equation is a statement in the form 𝑎𝑥 2 + 𝑏𝑥 + 𝑐 = 0 for 𝑎, 𝑏, 𝑐𝜖ℝ, 𝑎 ≠ 0
Formula of Sum of Root of Quadratic equation
𝑥1 + 𝑥2 =
−𝑏
𝑎
Formula of Product of Root of Quadratic equation
𝑐
𝑥1 ∙ 𝑥2 =
𝑎
C. Learning Method
: Direct Learning, Discussion
D. Learning Activities
Teacher’s Activities
No
1.
Student’s Activities
Introduction

Teacher help students for
remember previous Lesson

Any Students tell about
how to Finding out roots
Time
about Finding out roots of
of quadratic equation by
quadratic equation by using
using quadratic formula.
quadratic formula.
(𝑥 =
 Give motivation to students
and tell about function and
−𝑏 ± √𝑏 2 − 4𝑎𝑐
)
2𝑎
2 minute
 listen
motivation
and
Learning objective from
teacher.
application this lesson.
2.
Main Activities

Ask students to make team
 Make team such as 3
member.
such as 3 member.

 Do worksheet in their team.
Give worksheet
 Control discussion and lead
students
to
do
 Discussion about their
answer in team.
their
worksheet.

Help students to argumen
 Students present their
and
answer and conclusion.
 Teacher direct students to get
 For the conclusion and
their
answer
conclusion.
the
teacher’s explain, students
formula of sum and product
get the formula of sum and
of
product of roots of quadratic
the
concept
roots
about
of
quadratic
equation.
equation.

7 minute
Reflect
the
student’s
 Answer the first problem
and do a new problem from
concept and make it right.
teacher.
3.
Closing


Teacher asking a students
Students
present
to give a conclusion about
conclusion
the lesson today.
formula
of
sum
product
of
roots
Teacher
give
homework
and explain about next
lesson in next meeting
E. Tools and References
References :

about
quadratic equation.
the 1 minute
and
of
-
Textbook (Kurnianingsih, Sri, dkk. 2009. Mathematics for Senior High School
Grade X. Jakarta: Esis)
-
Worksheet.
-
Other reference book.
Tools :
Laptop
LCD
OHP
F. Assessment
Technique
: Test
Form
: Essay
No
Question
score
1.
If 𝑥1 and 𝑥2 are the roots of quadratic equation 𝑥 2 − 2𝑥 − 8 = 0,
determine
a. 𝑥1 + 𝑥2
40
b. 𝑥1 𝑥2
c. 𝑥1 2 + 𝑥2 2
2.
Let 𝑝𝑥 2 − (2𝑝 − 3)𝑥 + (𝑝 + 6) = 0 has similar roots, find
30
a. the value of 𝑝
b. the roots.
3.
Let 𝑥1 and 𝑥2 are the roots of quadratic equation 2𝑥 2 − 14𝑥 +
30
3𝑘 − 4 = 0. And let 𝑥1 2 − 𝑥2 2 = 21. Find the value of 𝑘.
Approved by,
Inderalaya, August 2013
School Advisor
Teacher
........................
..................
NIP.
NIP.
Name : Puteri Aprilianti
NIM : 06101008036