1TTO §12.3 Multiplication and addition PTI

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

Here are the LIKE TERMS again, never leaving us alone.

However, recognising them makes your Maths life easier!

Task:  Try to find the final answer for the easiest one.

Remember your answer, because you won't see the task in the next slide!

The answer to the easiest one is:

8⋅5​2​​+2⋅5​2​​=or8⋅7​2​​+2⋅3​2​​=

1. 25
2. 50
3. 269
4. 250

Solution:

Solution:

Did you notice that this task was all

about LIKE TERMS?

The terms 8 x         and

  2 x              are the like terms here.

5​2​​

5​2​​

Task: Which has LIKE TERMS: A, B or C?

Like terms are in:

1. A
2. B
3. C

All this information...

If it goes a bit too quick for you, 

or it's a bit too much, then remember:

- It's just to warm you up for doing the § on your own.

- Doing your homework might go easier when you've been through the Theory and some Tasks too!

A.   Intro to the coming THEORY:

Do you remember this, about shortening? Just watch:

1f = f          1x = x

-1f = -f       -1x = -x

This was Ch 10. The same thing applies with squares!

Watch the next slide and be amazed.

  B. Intro to the next slide, first this recap:

Basic rules:      1f = f    or     f = 1f          and        -1h = -h         or       -h = -1h

4f + 3f = 7f

4f + f = 4f + 1f = 5f

7d - d = 7d - 1d = 6d

Next we will look at similar calculations, only now with quadratic tasks!

How to solve this exercise?

-see next slide too!-

How to solve this exercise? Like this:

FIRST WORK THEM OUT; ONLY THEN YOU CAN MAKE PAIRS!

FIRST WORK THEM OUT; ONLY THEN YOU CAN MAKE PAIRS!

Okay, let's do a bit together now:

1.                          x                =

So now it is obvious that  formula 1 and formula 7  are equal!

When doing 21 for homework, work them all out and only then combine them!

Homework time.

Do §12.3 now.