MATHEMATICS GRADE 9-ENTRY VIDEO SCRIPT
QUARTER I
Week 1 – Day 1
Content Standard
Performance Standard
MELC
The learner demonstrates understanding of key
concepts of quadratic equations, inequalities and
function, and rational algebraic equations.
The learner is able to investigate thoroughly
mathematical relationships in various situations,
formulate real- life problems involving quadratic
equations, inequalities and functions, and rational
algebraic equations and solve them using a variety of
strategies.
Illustrates quadratic equations
(M9AL-Ia-1)
I. SCRIPT
Script
Now, by definition, yáll know that quadratic
equation is an equation in second degree. I have here a
problem which I need you to tell me whether or not it
illustrates quadratic equation. Afterwards, let us justify
your answer by representing a situation by a
mathematical sentence.
Here’s the problem: The length of a swimming
pool is 8m longer than its width and the area is 105m2.
(Read again)
Do you think our problem here illustrates a
quadratic equation? Let us cross-section. Initially, we
have a swimming pool. You may be asking what’s the
shape of the pool—may it be square, rectangle, circle or
pentagon perhaps, right? But we also have context clues
right there, that it has length and width, and the area is
given. Now, students, try to brainstorm what
mathematical concept applies area, length and width?
Yes, it’s the area of a rectangle. Now, the formula for
the area of rectangle is 𝐴 = 𝑙𝑤.
Furthermore, we know for a fact that the area of
the pool is 105m2 and its length is 8m longer than its
width. To translate these things to mathematical
sentence, let us represent the area as a, length as l and
width as w like we use to do. Therefore, we get: 𝑎 = 𝑙𝑤
such that 𝑎 = 105𝑚2 , 𝑙 = 𝑤 + 8𝑚 (m as a unit) and
𝑤 stays as is.
Now, by substitution, 𝑎 = 𝑙𝑤
Prepared by: REYMOND C. ADELFA
Guinoman National High School
MATHEMATICS GRADE 9-ENTRY VIDEO SCRIPT
105𝑚2 = (𝑤 + 8𝑚)(𝑤)
105𝑚2 = 𝑤 2 + (8𝑤)𝑚
property
𝑤 2 + (8𝑤)𝑚 = 105𝑚2
to make it in standard form.
by distributive
by additive property
In conclusion, by that standard form we get, does
the problem illustrate quadratic equation? Yes, because
the equation is in second degree and that justifies the
definition of quadratic equation.
So there we go, students, always remember that if
an equation is in second degree, it is a quadratic
equation.
Annotation Given the limited time of 2 minutes, I skip the initial
procedures of teaching and decide to go through the
discussing part for me to be able to showcase my
mastery of the competency.
II. ACKNOWLEDGMENT
Mercy Q. Jayoma of Siaton National High School
Credits to
Teachers of Guinoman National High School
Prepared by: REYMOND C. ADELFA
Guinoman National High School