(a + b) & # - 16 (a + b) + 64 factorization

(a + b) & # - 16 (a + b) + 64 factorization

Original formula = (a + B-8) (a + B-8)

（a²+b²﹚﹙a²+b²-8）+16
Factorization

（a²+b²﹚﹙a²+b²-8）+16
=(a²+b²)²-8(a²+b)²+16
=(a²+b²-4)²

（a+b)²-8（a²-b²)+16（a-b）²

（a+b)²-8（a²-b²)+16（a-b）²
=（a+b)²-8（a+b)(a-b)+[4（a-b）]²
=[(a+b)-4（a-b）]²
=(a+b-4a+4b)²
=(3a+5b)²

How to calculate the speed change, scalar or vector
Acceleration is the change of velocity in unit time!
That is to say, is the change of velocity scalar or vector!
People's education edition of high school physics writing should be vector! But the physics paper does choose it right,

Acceleration is the change of velocity per unit time in numerical value, which is right. Acceleration is a vector, but the change of acceleration is only a mathematical quantity, which has no direction

A teacher in a school will lead students to Huzhu Beishan during the holiday. It is known that the price quoted by two travel agencies is 240 yuan per person
The first travel agency said that "if the teacher charges according to the actual quotation, all the others will get half price discount." the second travel agency said that "everyone will get a 60% discount on the quotation" and set the number of students as X
(1) Write out the functional relationship between the actual charge amount y (yuan) of the two hotels and the number of students x (person)
(2) What is the number of students, the two fees equal?

When I went to Beishan, I was a phoenix brand Dalian tile bicycle. It cost ten yuan to go back and forth

Lim 1-cos5x / x ^ 2 x tends to 0
High number,

Derivation of 0 / 0 equation
=lim 5sin5x/2x=lim25cos5x/2=25/2
or =lim 2sin^2(5x/2)/((5x/2)^2*4/25)=2*25/4=25/2

Find the definition field of the following function y = 3x-1, y = √ x + 1——
Find the definition field of the following function y = 3x-1, y = √ x + 1 -- X

Replace (1) with (2)
3x-1=√x+1
(3x-2) square = x
9x square - 13X + 4 = 0
（x-1）（9x-4）=0
So x = 1 or 4 / 9

Where are you from

where are you from?

One millionth of 100 m is equal to () mm
One millionth of a square meter is equal to () square millimeter
One millionth of a cubic meter is equal to () cubic millimeter

1、 0.1
two point one
three point one zero zero zero

Given the point (√ 2,2) on the image of the power function f (x), {- 2,1 / 4}, on the image of the power function g (x), if x is the sum value, f (x) > G (x)

If the point (√ 2,2) is on the image of power function f (x), then f (x) = x ^ 2
Let g (x) = x ^ (- 2)
x^2=1/x^2
The solution is: x = 1 or - 1
When f (x) > G (x), the interval is:
x> 1 or X