To find out the missing term of the right side of the equation, we must expand (2a + 1.5b)^2:
[tex](2a+1.5b)^2 = (2a+1.5b)(2a+1.5b)\\\\=2a * 2a + 2a * 1.5b + 1.5b *2a + 1.5b * 1.5b\\\\= 4a^2 + 3ab + 3ab + 2.25b^2\\\\=4a^2 + 2.25b^2+6ab[/tex]
Therefore by comparing the two equations, we see the missing term is 6ab.
Hope that helped!
