• The given expression is (64)2 - (36)2 = 20z
• The standard form of the given expression can be written as 642 - 362 = 20z
• On simplifying the expression, we get 4032 - 1296 = 20z
• Subtracting 1296 from both sides of the equation, we get
4032 - 1296 = 20z
• 2736 = 20z
• Dividing both sides of the equation by 20, we get
2736/20 = z
• Therefore, z = 137
• Hence, the value of z is 140.

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