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If y= 3x^2 + x^2 - 5 and z= x^2 - 12, which polynomial is equivalent to 2(y+z)? Please show your work

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If y= 3x^2 + x^2 - 5 and z= x^2 - 12, which polynomial is equivalent to 2(y+z)? *Please show your wo...

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If y= 3x^2 + x^2 - 5 and z= x^2 - 12, which polynomial is equivalent to 2(y+z)? *Please show your work*​

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If y= 3x^2 + x^2 - 5 and z= x^2 - 12, which polynomial is equivalent to 2(y+z)? Please show your work