-18
x2 - x = 20 x2 - x - 20 = 0 (x - 5)(x + 4) = 0 x - 5 = 0 and x + 4 = 0 So, x = 5 ans x = -4
5x=4y=-20 x=-4 y=-5 (-4,-5) is the ordered pair
4x = 20 x = 5 (divide both sides by 4)
That's what the communtitive property is, changing the order. like 4+5=9; 5+4=9. So 4x5=20 and 5x4=20.
5 x 4 = 20 4 x 5 = 20
No, 4 x 5 equals 20.
4 x 5 = 20 !
x/4 + 5 = -1 (4)x/4 +(4)5 = -1 x+20 = -1 -20 -20 x= -21 x= -21
x2 = x+20 x2-x-20 = 0 (x-5)(x+4) = 0 x = 5 or x = -4
-18
x2 - x = 20 x2 - x - 20 = 0 (x - 5)(x + 4) = 0 x - 5 = 0 and x + 4 = 0 So, x = 5 ans x = -4
-4 x 5
4, -5
1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1.
20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19
(x+4)(x-5) = 0