5 x -10 = -50
x+5=10 x+5-5=10-5 x=5
(5)21 x (4)11 = (5)11 x (5)10 x (4)11 = (5)10 x (5 x 4)11 = (5)10 x (20)11 =(5)10 x 20 x (20)10 = 20 x (5 x 20)10 = 20 x (100)10 = 2 x (10)1 x (10)20 =2 x (10)21 = 2,000,000,000,000,000,000,000
865 = (8 x 100) + (6 x 10) + (5 x 1) OR (8 x 10^2) + (6 x 10^1) + (5 x 10^0)
-5
1 x 10, 2 x 5, 5 x 2, 10 x 1.
x+5=10 x+5-5=10-5 x=5
5
How about 5 x 9 x enough multiples of 10 to give you 5 digits? 5 x 9 = 45 5 x 9 x 10 = 450 5 x 9 x 10 x 10 = 4500 5 x 9 x 10 x 10 x 10 = 45000 18225
5 x -2 = -10
5
(5)21 x (4)11 = (5)11 x (5)10 x (4)11 = (5)10 x (5 x 4)11 = (5)10 x (20)11 =(5)10 x 20 x (20)10 = 20 x (5 x 20)10 = 20 x (100)10 = 2 x (10)1 x (10)20 =2 x (10)21 = 2,000,000,000,000,000,000,000
865 = (8 x 100) + (6 x 10) + (5 x 1) OR (8 x 10^2) + (6 x 10^1) + (5 x 10^0)
-2 times 5 = -10 1 x -10 2 x -5 5 x -2 10 x -1
-5
3 x 5 x 10 = 150
x^2 - 3x -10 is x^2 - 5x + 2x -10 which is x(x -5) + 2(x - 5) which is (x + 2)(x - 5) and when you divide this by x + 2 the answer would be x - 5
5 x 10-10 = 0.0000000005