X^2-x-20
= x^2-5x+4x-20
= x(x-5)+4(x-5)
= (x+4)(x-5)

Binomials are algebraic expressions of the sum or difference of two terms. Some binomials can be broken down into factors. One example of this is the "difference between two squares" where the binomial a2 - b2 can be factored into (a - b)(a + b)

Factors of 75 are = 3*5*5
Factors of 25 are = 5*5
so, LCM is 3*5*5 = 75

3x+4y=-2...(1)
x=2y...(2)
put the value of x from eq. (2) to eq.(1)
3*(2y)+4y=-2
6y+4y=-2
10y=-2
y=-1/5
put the value of y into eq.(2)
x=2*(-1/5)
x=-2/5
values are : X=-2/5 and y=-1/5

(2/3) divided by (1/6)
= (2/3) / (1/6)
= (2/3) x (6)
= 4

X^2 - 5x - 6
x^2 - 6x + x -6
x(x-6)+1(x-6)
(x+1)(x-6)

The number you get when you multiply an integer by itself.
Example: 4 × 4 = 16, so 16 is a square number.

Cnidaria (jellyfish, anemore hydra).

The factors of 57 are : 1,3,19,57

Radius=diameter/2

5/x = 10/3x+4
10x = 5(3x+4)
10x = 15x + 20
10x - 15x = 20
-5x = 20
x = -4

15/x = 3/x-7
3x = 15(x-7)
3x = 15x - 105
3x - 15x = -105
-12x = -105
x = 105/12 = 35/4

20% of 50
= (20/100) * 50
= 10

Let the value is x%
then, (x*84)/100 = 21
x = (21*100)/84
x = 25

X^2 - 9x + 20 = 0
x^2 - 5x - 4x + 20 = 0
x(x-5)-4(x-5) = 0
(x-4)(x-5)=0
x = 4,5

1/2 of two third
= (1/2)*(2/3)
= 1/3

10% of 2000
= (10/100)*2000
= 200

(6x^2 + 11xy - 11y^2) + (3x^2 - 5xy - 8y^2)
= (6x^2 + 3x^2) + (11xy - 5xy) + (-11y^2 - 8y^2)
= 9x^2 + 6xy - 19y^2

220 = 2x-12x
220 = -10x
x = -22

4/5 is bigger than 3/5.