Answer:
Read explanation and apply it
Step-by-step explanation:
The vertex form of a quadratic equation is  
The general form of a quadratic equation is 
The factored form of a quadratic equation is 
The one which reveals the zeros of f(x) without needing to alter the equation is the factored form   .
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When f(x)=0, we have  
The values of x are  and
 and  .
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I hope this guides you to choose the correct answer.