I guess you mean: what two numbers sum to 31 and multiply together to get 150?
6 & 25
(6 + 25 = 31, 6 x 25 = 150)
1/x + 1/y = (y+x)/xy But y + x = sum = 150, and xy = product = 40 So sum of reciprocals = 150/40 = 3.75
If two numbers have a sum of 31 and a product of 228, then the two numbers are 12 and 19. Adding them will give you 31, and multiplying them gives you 228.
The product of a sum and a difference with 31 times 29 is:(30+1) x (30-1)sum to differencemakea product= 30² - 1²= 900 - 1= 899
31
150
25 and 6.
1/x + 1/y = (y+x)/xy But y + x = sum = 150, and xy = product = 40 So sum of reciprocals = 150/40 = 3.75
-25 and 6
If two numbers have a sum of 31 and a product of 228, then the two numbers are 12 and 19. Adding them will give you 31, and multiplying them gives you 228.
The product of a sum and a difference with 31 times 29 is:(30+1) x (30-1)sum to differencemakea product= 30² - 1²= 900 - 1= 899
31
10 and 15
150*6800/(150+6800) = 1020000/6950 = 146.7626 (to 4 dp)
150
31
1+30=31 and 1x30=30
30 and 1. 30*1 is 30, 30+1 = 31.