Whakaoti mō z
z=-9
Tohaina
Kua tāruatia ki te papatopenga
20z+140=2\left(2z-2\right)
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te 5z+35.
20z+140=4z-4
Whakamahia te āhuatanga tohatoha hei whakarea te 2 ki te 2z-2.
20z+140-4z=-4
Tangohia te 4z mai i ngā taha e rua.
16z+140=-4
Pahekotia te 20z me -4z, ka 16z.
16z=-4-140
Tangohia te 140 mai i ngā taha e rua.
16z=-144
Tangohia te 140 i te -4, ka -144.
z=\frac{-144}{16}
Whakawehea ngā taha e rua ki te 16.
z=-9
Whakawehea te -144 ki te 16, kia riro ko -9.
Ngā Tauira
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Poukapa
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whārite Simultaneous
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Whakarerekētanga
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Whakaurunga
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Ngā Tepe
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}