Multiply by .

Subtract from .

Factor out of .

Rewrite as .

Pull terms out from under the radical.

Evaluate Using the Given Value f(20) = square root of 5(20)-4

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# Evaluate Using the Given Value f(20) = square root of 5(20)-4

Multiply by .

Subtract from .

Factor out of .

Rewrite as .

Pull terms out from under the radical.

Evaluate Using the Given Value f(20) = square root of 5(20)-4