Question

a square number and a multiple of 3 have a total of 90 what r the 2 numbers

Answer 1

Hello,

Let's x² the square number

and 3*y the multiple of 3.

$x^2+3y=90\\\\\boxed{y=-\dfrac{1}{3} x^2+30}$

2 solutions : for (x,y) as integers : (-6,18) and (6,18)

but one solution for (x²,3y) as integers : (36,54)