2 power of a b 4ab of a b and 2 power of a b

1. If the 2nd power of (a b) = 5 and ab = 1, then a-b = (1).

Because (a b) 2=a 2 b 2 2ab=5, so: (a-b) 2=a 2-2ab b b 2=(a b) 2-4ab=5-4x1=1

Therefore: a-b = 1.

2. If x-y=3 and xy=10, then x to the 2nd power and y to the 2nd power = 29.

Because x to the power of 2 y to the power of 2 = (x-y) 2 2xy = 9 20 = 29.

3. (x y) to the 2nd power = 3, (x-y) to the 2nd power = 5, then xy = (-1 2); x to the 2nd power y to the 2nd power = (4).

Because: (x y) to the 2nd power = x to the 2nd power y y 2xy = 3 ......(1)；

x-y) to the 2nd power = x to the 2nd power y y to the 2nd power - 2xy = 5 ......(2)；

1) Eq. - (2) Eq. : xy=-1 2;Eq. (1) (2) gives the 2nd power of x and the 2nd power of y = 4.

A's 2nd recital (a-b) + B's Ye Fenghui 2nd power (base pin b-a) a 3-a 2b + b 3-ab 2

a^3+b^3-a^2b-ab^2

a+b)(a^2-ab+b^2)-ab(a+b)(a+b)(a^2-ab+b^2-ab)

a+b)(a-b)^2

Original formula = (a 2 + b 2) (a 2 - b 2) = a 4 - b 4

Twice with the squared difference formula.

Using the principle of method difference, (a+b)(a-b)=a2-b2

So (a 2 + b 2) (a 2-b 2) = a 4-b 4, which is to treat a 2 and b 2 as a whole.

(a +b) (a+b)(a-b) = (a +b) (a -b) = the fourth power of a - the fourth power of b.

(a-b) (b-a) to the power of 2 (-a+b) to the power of 4.

a-b) to the power of 3 (a-b) to the power of 4.

a-b).

(a-b) (b-a) to the 2nd power (-a+b) to the 4th power = (a-b) (a-b) to the 2nd power (a-b) to the 4th power (a-b) = (a-b) to the (1+2+4) power.

a-b).

4a quadratic + 4ab + b quadratic - 9a quadratic + 6ab-b quadratic + 5a quadratic - 5ab

Hello (2nd power of a - 2nd power of b) (a-b) = a+b(2nd power of a - 2nd power of b) (a-b).

a+b）(a-b)÷(a-b)

(a²-b²)÷a-b)

(a+b)(a-b)]÷a-b)

A+B is happy to answer your questions and wish you good luck! The Beauty of Mathematics team will answer your questions.

Press the multiplication formula to open and you will know.

According to the multiplication formula, the 2nd power of (a+b) and the 2nd power of (a-b) are the symbols of the middle term 2ab of the difference.

So, 2 power of (a+b) = 2 power of (a-b) + (4ab), 2 power of (a-b) = 2nd power of (a+b) - (4ab).