what is another way of writing (3x2) + (4x8)

If your expression means:

3 x² + 4 x⁸

then

3 x² + 4 x⁸ = x² ( 3 + 4 x⁶ )

If your expression means:

3 ∙ 2 + 4 ∙ 8

then

3 ∙ 2 + 4 ∙ 8 = 6 + 32 = 38