Is it possible to find lattice points that are (sqrt of 15) units apart?

Lattice points are an integer distance apart on the x axis,  or on the y axisif you had 2 units apart on the x and 3 units on the y, then (on the diagonal) you could get a pair that is sqrt(2^2 + 3^2)= sqrt(13) apart.but if you look at all pairs for 15, you will not get a pair which are perfect squares

The GCF of 3x^4, 15x^3 and 21x is 3x^2

Step-by-step explanation:

3x^2(x^2), 3x^2(5x) , 3x^2(7)