Question: 20. Identify the values of the variable for which each expression is defined where necessary, then expand and simplify. a) (3-5)(3+5) b) (4x+(x+) 21.

20. Identify the values of the variable for which each expression is

20. Identify the values of the variable for which each expression is defined where necessary, then expand and simplify. a) (3-5)(3+5) b) (4x+(x+) 21. Rationalize the denominator. a) 23-4 47 22. Rationalize the denominator. a) 57 3+5 b) 42+23 5 b) 25-4 73-7

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