8 × 5^x = 23
→ 5^x = 2.875
→ x log 5 = log 2.875
→ x = log 2.875 ÷ log 5
(You can use logs to any base as long as the same base is used for both of the logs.)
1 x 85, 5 x 17, 17 x 5, 85 x 1.
1 x 85, 5 x 17
1 x 85, 5 x 17,
23 x 23 equals 529.
5 x 17 = 85
63 = (2x3)3 = 23 x 33 36 = 33+3 = 33 x 33 As 2 ≠ 3 then 23 ≠ 33 ⇒ 63 = 23 x 33 ≠ 33 x 33 = 36 ⇒ 63 ≠ 36
17 x 5
x to the power a divided by x to the power b is x to the power (a - b) When a and b are equal then this is x to the power a divided by x to the power a, ie 1. x to the power (a - a) = x to the power zero. Things which are equal to the same thing are equal to each other, so 1 = x to the power zero.
23 x 1 = 23
85 is a composite number because a number can equal it: 5 x 17 = 85
234 = 23 x 23 x 23 x 23 = 279841 235 = 23 x 23 x 23 x 23 x 23 = 6436343
The two numbers that multiply together to equal 7225 are 85 and 85. This is because 85 multiplied by 85 equals 7225. In mathematical terms, 85 * 85 = 7225.