Factoring 25X ^ 2-9 = 0

Factoring 25X ^ 2-9 = 0

25x²-9=0
25x²=9
x²=9/25
x=±3/5
Factorization
25x²-9=0
(5x+3)(5x-3)=0
X = - 3 / 5 or x = 3 / 5

2 / 3 divided by 4 / 15-2.5 = 3 / 11 by 2 / 7 by 7 by 1 / 2 = 19 / 100 by 101 3 / 8 by 1 / 15 + 5 / 8 divided by 15

Hello, 2 / 3 △ 4 / 15-2.5 = 2 / 3 × 15 / 4-2.5 = 5 / 2-2.5 = 0 3 / 11 × 2 / 7 × 7 × 1 / 2 = 3 / 11 × (2 / 7 × 7 × 1 / 2) = 3 / 11 × 1 = 3 / 11 19 / 100 × 101 = 19 / 100 × (100 + 1) = 19 + 19 / 100 3 / 8 × 1 / 15 + 5 / 8 △ 15 = 3 / 8 × 1 / 15 + 5 / 8 × 1 / 15 = (3 / 8 + 5 / 8) × 1 / 15

Saw the 1.5-meter-long cuboid wood into three sections, and the surface area increased by 48 square decimeters. The original volume of the wood was () cubic meters

0.18

There is a six digit number whose highest digit is 7. Move the 7 on the highest digit of the number to the end of the number, and the new number is just the number divided by 5
There is a six digit number whose highest digit is 7. Move the 7 on the highest digit of the number to the end of the number, and the new number is just the number obtained by dividing the number by 5. Find the six digit number

1/7=0.142857
5/7=0.714285
This six digit number is 714285

If both sides of the equation 7y-6 = 3Y are () at the same time, 4Y = 6 is obtained. The basis for doing this is ()
If 10 of a = 5 of B, then a = ()
If quarter x = 2x-3, then x = ()
If 5x + 2 = 2X-4, then 3x = (), x = ()
If one third x = 2X-4, then - five thirds x = (), x = ()
I have to finish it at 9:30. OK, add 10

On both sides of the equation 7y-6 = 3Y at the same time (), 4Y = 6 is obtained. The basis for doing so is () what is the question to be asked?
If 10 of a = 5 of B, then a = (2b)
If quarter x = 2x-3, then x = (12 / 7)
If 5x + 2 = 2X-4, then 3x = (- 6), x = (- 2)
If one third x = 2X-4, then - five thirds x = (4), x = (12 / 5)

Can 18 × 4 of 25 + 11 × 18 of 25 be easily calculated

18 × 4 of 25 + 11 × 18 of 25
=18/25x4+11/25x18
=18/25x4+18/25x11
=18/25x(4+11)
=18/25x15
=54/5
=10.8

When x = half and y = - 2, find the value of the algebraic expression
When x = half, y = - 2, find the value of the algebraic formula "(x + y) square - (X-Y) square-3xy". Replace x, y with other two numbers, and then calculate. What rules do you find

==xy
x=1/2,y=-2
The original formula = xy = - 1

Fill the nine numbers - 4, - 3, - 2, - 1,0,1,2,3,4 in the nine spaces of the square matrix as shown in the figure, so that the sum of the three numbers in the horizontal, vertical and diagonal angles is equal
9 palace grid

-3 4 -1
2 0 -2
1 -4 3

To solve the equations 4S + 3T = 5 2s-t = - 5, add or subtract? Why add or subtract,

Analysis: when the two sides of the second equation are multiplied by 3, the coefficient of t can become the opposite number. Adding them can eliminate t
{4S+3T=5…… ①
2S-T=-5 …… ②
② X 3
6S-3T=-15…… ③
① + 3, get
10S＝-10
S＝-1
Substituting s = - 1 into 2, we get
-2-T＝-5
T＝3
The solution of the original equations is: {s = - 1
　　　　　　　　　T＝3

F (x) is a polynomial. The remainder of F (x) divided by 2 (x + 1) and 3 (X-2) are 1 and - 2
What is the remainder of 5F (x) divided by x ^ 2-x-2?

Let f (x): F (x) - 1 = P (x) * 2 (x + 1) f (x) + 2 = q (x) * 3 (X-2) because x ^ 2-x-2 = (x + 1) (X-2), so (f (x) - 1) * (X-2) = 2p (x) * (x + 1) * (X-2) (f (x) + 2) * (x + 1) = 3Q (x) * (X-2) * (x + 1), we get - 3f (x) - 3x = [2p (x) - 3Q (x)] * (X-2