Q. 5 C5.0( 3 Votes )

Find the product of the following :

(x + y + z) (x + y – z)

Answer :

x(x + y-z) + y(x + y-z) + z(x + y-z)


(x× x + xy -xz ) + (yx + y × y -yz) + (zx + zy -z × z)


(x1 + 1 + xy -xz ) + (yx + y1 + 1 -yz) + (zx + zy -z1 + 1)


( an + m = an × am)


x2 + xy -xz + xy + y2 -yz + xz + yz -z2


x2 + y2 -z2 + xy + xy -xz + xz -yz + yz


x2 + y2 -z2 + (1 + 1) xy + (1-1)xz + (1-1)yz


x2 + y2 -z2 + 2xy


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