"Square Difference Formula" PPT courseware

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"Square Difference Formula" PPT courseware

Can you answer the multiplication rule for polynomials?

(a+b)(m+n)=am+an+bm+bn

Calculate and compare to see who can calculate faster and more accurately

(a+b)(a-b)=a2-b2

①(x＋2)(x－2)

②(1+3a)(1-3a)

③(m＋5n)(m－5n)

④(3y＋z)(3y－z)

Can you prove that (a+b)(a-b)=a2-b2?

1. Use the polynomial multiplication rule to verify:

(a+b)(a-b)

=a2-ab+ab-b2

= a2-b2

2. Use the area of ​​the graph to prove.

Square difference formula:

(a+b)(a−b)=a2−b2

The product of the sum of two numbers and the difference of the two numbers is equal to the squared difference of the two numbers.

Characteristics of squared difference formula

The same number (term) is a

(a+b)(a-b)=(a)2-(b)2

The opposite number (term) is b

The square of the same number (term) minus the square of the opposite number (term)

1. Fill in the blanks with reference to the square difference formula "(a+b)(a-b)=a2-b2".

(1)(-a+b)(a+b)= ________

(2)(a-b)(b+a)=__________

(3)(-a-b)(-a+b)=________

(4)(a-b)(-a-b)=_________

2. Fill in the table using the square difference formula.

3. Determine whether the square difference formula can be used in the following formula.

(1)(-a+b)(a+b)

(2)(-2a+b)(-2a-b)

(3)(-a+b)(a-b)

(4)(a+b)(a-c)

summary:

What did you gain from studying this lesson?

1. What is the square difference formula?

2. Pay attention to the following when using formulas:

(1) The squared difference formula can only be used if it conforms to the characteristics of the formula;

(2) Some formulas cannot be applied to the formula on the surface, but the formula can be applied to the essence. Pay attention to the deformation.

Keywords: Square Difference Formula Teaching Courseware, Qingdao Edition 7th Grade Mathematics Volume 2 PPT Courseware Download, 7th Grade Mathematics Slide Courseware Download, Square Difference Formula PPT Courseware Download, .PPT format;

For more information about the "Formula of Squared Differences" PPT courseware, please click the "Formula of Squared Differences" ppt tab.

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Update Time: 2024-09-06

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