<h5>What is the average of x&sup2;+2x-3, 3x&sup2;-2x-3 and 30-4x&sup2;?</h5>

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What is the average of x²+2x-3, 3x²-2x-3 and 30-4x²?

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What is the average of x²+2x-3, 3x²-2x-3 and 30-4x²?