(- 2x-1) (2x-1) = 4x ^ 2-1, calculated by square formula difference If not, how to correct it

(- 2x-1) (2x-1) = 4x ^ 2-1, calculated by square formula difference If not, how to correct it

(-2x-1)(2x-1)=-(2x+1)(2x-1)=1-4x²
Hello, Shao Wenchao, potato group. I'll help you
If you don't understand this question, you can ask. If you are satisfied, remember to adopt it
The answer is not easy, please understand, thank you
I also wish you progress in your study!

(X-Y) & sup2; - 2x + 2Y + 1 how to calculate, read out is the square of X-Y minus 2x + 2Y + 1, fast, fast! First aid please!

I'm in mortal danger,
(x-y）²-2x+2y+1
=(x-y）²-2（x-y）+1
=（x-y-1）²

Can you tell me there is a library near here?
In a hurry

Can you tell me if there is library near here

Proof: when n is an integer, the square difference of two consecutive odd numbers is a multiple of 8

Prove: any odd number can be expressed as 2n + 1, then the odd number continuous with it is 2n + 3, where n is an integer
The square difference between the two numbers is
(2n+3)^2 - (2n+1)^2
= (4n^2 + 12n +9) - (4n^2+4n+1)
= 8n+8
= 8(n+1)
Since 8 (n + 1) / 8 = n + 1 and N is an integer,
So 8 (n + 1) is a multiple of 8, that is, the square difference of two consecutive odd numbers is a multiple of 8

Find the limit LIM (T - > 0 +) 1 / T ^ 2 ∫ (0 ~ t) DX ∫ (0 ~ t-x) e ^ (x ^ 2 + y ^ 2) dy, master help,

F (T & # 178;) = ∫ [0, t] DX ∫ [0, t-x] e ^ (X & # 178; + Y & # 178;) dy is transformed into polar coordinates D: 0 ≤ R ≤ T / (sin θ + cos θ), 0 ≤ θ ≤ π / 2 = ∫ [0, π / 2] d θ ∫ [0, t / (sin θ + cos θ)] e ^ (R & # 178;) r Dr = ∫ [0, π / 2] (1 / 2) [e ^ {T & # 178; / (...)

15.8 * 69.3-69.3 * 15.8 simple calculation

15.8*69.3-69.3*15.8=0

Simple calculation: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + +100．

1+2+3+4+5+6+7+8+9+10+… +100=100×(100+1)2=50×101=5050．

What is the parameter equation of hyperboloid with one sheet?
How did it come out?

x=a secu cosv
y=b secu cosv
z=ctgu

The difference between snow and ice
It's better to explain in English

Snow is frozen precipitation in the form of white or translucent hexagonal ice crystals that fall in soft,white flakes.Ice is frozen solid which feels colder and much harder than snow.

Is f in F = ma a combined external force
RT

Yes, f refers to the resultant force of all external forces received by the object, including gravity, friction, supporting force, etc