a. B is a rational number. Now a new algorithm is provided: a △ B = the square of a + 2Ab, if (- 2) △ x = - 6 + X, then X=

a. B is a rational number. Now a new algorithm is provided: a △ B = the square of a + 2Ab, if (- 2) △ x = - 6 + X, then X=

(－2)△x=(－2)²＋2×(－2)x=－6＋x
4－4x=－6＋x
x=2

If the square of x = a, then () is called ()
Square root

If the square of x = a, then (x) is called the square root of (a)

The square of X (a-b) + 9 (B-A)
Factorization-_ -#Well, I'm too lazy to think about it

The square of X (a-b) + 9 (B-A)
=（a-b）（x^2-9)
=(a-b)(x+3)(x-3)

The parallelogram frame has a bottom of 12cm and a height of 5cm. If it is drawn into a rectangle, its area is 12cm square larger than that of the parallelogram, the perimeter of the parallelogram can be calculated?

If it is to find the perimeter, C parallelogram = (12 + 5) x2 = 34

The circumference of a semicircle is 51.4 decimeters. How many square decimeters is the area of this semicircle

51.4÷（2+3.14）=10dm
3.14 × 10 square △ 2 = 15.7 square decimeter

The tangent equation and normal equation of F (x) = INX at M (E, 1) need to be solved

f'(x)=1/x
Then the tangent has a slope k = f '(E) = 1 / E
The tangent equation is Y-1 = 1 / E (x-e)
That is y = x / E
The slope of normal K '= - 1 / k = - e
That is, the normal equation is Y-1 = - E (x-e)
That is y = - ex + e ^ 2 + 1

Solution on inequality (x ^ 2-7x-18) / (X-5)

x^2-7x-18=（x-9）（x+2）
The original inequality is equal to (X-9) (x + 2) (X-5)

What is the minimum value of quadratic function y = x & # 178; + 6x?

y=x²+6x+9-9
=(x+3)²-9
The minimum is - 9

A negative number is nine times its reciprocal. This number is

Let this number be x (x0 rounded off)

If x y is a positive number, then the minimum value of (x + 1 / 2Y) ^ 2 + (y + 1 / 2x) ^ 2 is?

5. X ＾ 2 y ＾ 2 > = 2XY