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x^(2)+3+9-x^(2)=

x2+3+9−x2= x^{2}+3+9-x^{2}=

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Full solution

Q. x2+3+9−x2= x^{2}+3+9-x^{2}=
  1. Combine Like Terms: We are given the expression x2+3+9−x2x^{2} + 3 + 9 - x^{2}. The first step is to combine like terms. The like terms in this expression are x2x^{2} and −x2-x^{2}.\newlineCalculation: x2−x2=0x^{2} - x^{2} = 0
  2. Combine Constant Terms: Now we combine the constant terms, which are 33 and 99.\newlineCalculation: 3+9=123 + 9 = 12
  3. Final Simplification: Since x2−x2x^{2} - x^{2} equals 00, we are left with just the constant term, which is 1212. Final simplification: 0+12=120 + 12 = 12

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