Q : 3     Simplify.

          (vii)(1.5x-4y)(1.5x+4y+3)-4.5x+12y

Answers (1)

(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
                                                                 =  2.25x^{2} + 6xy + 4.5x  - 6xy - 16y^{2} - 12y   -4.5x + 12 y
                                                                 = 2.25x^{2}    - 16y^{2} 

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