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3x^{2}+3x\sqrt{7}-2\sqrt{7}x-2\left(\sqrt{7}\right)^{2}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 3x-2\sqrt{7} ki ia tau o x+\sqrt{7}.
3x^{2}+x\sqrt{7}-2\left(\sqrt{7}\right)^{2}
Pahekotia te 3x\sqrt{7} me -2\sqrt{7}x, ka x\sqrt{7}.
3x^{2}+x\sqrt{7}-2\times 7
Ko te pūrua o \sqrt{7} ko 7.
3x^{2}+x\sqrt{7}-14
Whakareatia te -2 ki te 7, ka -14.