Whakaoti mō x
x=-\frac{5}{21}\approx -0.238095238
Graph
Tohaina
Kua tāruatia ki te papatopenga
4-20x-x=9
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te 1-5x.
4-21x=9
Pahekotia te -20x me -x, ka -21x.
-21x=9-4
Tangohia te 4 mai i ngā taha e rua.
-21x=5
Tangohia te 4 i te 9, ka 5.
x=\frac{5}{-21}
Whakawehea ngā taha e rua ki te -21.
x=-\frac{5}{21}
Ka taea te hautanga \frac{5}{-21} te tuhi anō ko -\frac{5}{21} mā te tango i te tohu tōraro.
Ngā Tauira
whārite tapawhā
{ x } ^ { 2 } - 4 x - 5 = 0
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Whakarerekētanga
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Ngā Tepe
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