Question

Twice the square of a certain whole number addd to 3 times the number makes 90. find the number​

Answer 1

3.87

Explanation:

let the whole no is = x

twce the square of that no = 2x2

three times added 3(2x2) = 90

6x2 = 90

x2 = 15

x = root ( 15)

x = 3.87