Y is the square of a certain whole number added to three times a number makes 90 find the number
?? can't quite make out what you're saying
y^2 + 3y = 90
?? if so, it won't be an integer ...
unless "a certain whole number" is not "a number"
Maybe your question is:
y is twice the square of a certain whole number added to 3 times the number gives 90. Find the number
If that is the question then:
2 y² + 3 y = 90
2 y² + 3 y - 90 = 0
The solution are:
y = - 7.5 and y = 6
- 7.5 is not whole number.
So y = 6