20. If x = 4a2 + b2 - 6ab, y = 362 – 2a2 + 8ab and z = 622 + 862 – 6ab, find :
(i) X - Y - Z
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4a2 + b2 - 6ab - ( 362 - 2a2 +8ab) - (622 + 862 - 6ab)
4a2 + b2 - 6ab - 362 + 2a2 - 8ab - 622 - 862 + 6ab
6a2 + b2 - 14ab - 1846
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