Question:
Find the product:
(3x + 2y − 4) × (x − y + 2)
Solution:
By horizontal method:
$(3 x+2 y-4) \times(x-y+2)$
$x(3 x+2 y-4)-y(3 x+2 y-4)+2(3 x+2 y-4)$
$=3 x^{2}+2 x y-4 x-3 x y-2 y^{2}+4 y+6 x+4 y-8$
$=3 x^{2}-2 y^{2}-x y+2 x+8 y-8$
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