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9x squared= -18x+7 9x {}^(2) = - 18 + 7
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9x squared= -18x+7

9x {}^(2) = - 18 + 7

9x squared= -18x+7 9x {}^(2) = - 18 + 7-example-1
User Sam Dahan
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-9x^2=-18x+7\ \ \ |+9x^2\\\\9x^2-18x+7=0\\\\a=9;\ b=-18;\ c=7\\\\\Delta=b^2-4ac\to\Delta=(-18)^2-4\cdot9\cdot7=324-252=72\\\\\sqrt\Delta=√(72)=√(36\cdot2)=√(36)\cdot\sqrt2=6\sqrt2\\\\x_1=(-b-\sqrt\Delta)/(2a);\ x_2=(-b+\sqrt\Delta)/(2a)\\\\x_1=(18-6\sqrt2)/(2\cdot9)=(9-3\sqrt2)/(9)=(3-\sqrt2)/(3)\\\\x_2=(3+\sqrt2)/(3)
User Andrew Sutton
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