You can put this solution on YOUR website! If the sum of 60% of a fractional number and the number's square root is 5 greater than one fifth of the number, then the number is?
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Write an equation for what it says (1/5 = .2)
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square both sides
n = (-.4n+5)^2
n = .16n^2 - 2n - 2n + 25
0 = .16n^2 - 4n - n + 25
A quadratic equation
.16n - 5n + 25 = 0
using the quadratic formula; a=.16; b =-5; c=25
The fractional solution:
x = 6.25
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See if this check's out
3.75 + 2.5 = 5 + 1.25
6.25 = 6.25 confirms and also is our solution!
