Q : 3 Simplify.
(vii)
(1.5x - 4y) X (1.5x + 4y + 3) - 4.5x + 12y = (1.5x) X (1.5x + 4y + 3) -4y X (1.5x + 4y + 3) - 4.5x + 12y
= 2.25 + 6xy + 4.5x - 6xy - 16 - 12y -4.5x + 12 y
= 2.25 - 16