Whakaoti mō b
b = -\frac{12}{5} = -2\frac{2}{5} = -2.4
Tohaina
Kua tāruatia ki te papatopenga
-40b-64+4\left(5b+4\right)=0
Whakamahia te āhuatanga tohatoha hei whakarea te 8 ki te -5b-8.
-40b-64+20b+16=0
Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te 5b+4.
-20b-64+16=0
Pahekotia te -40b me 20b, ka -20b.
-20b-48=0
Tāpirihia te -64 ki te 16, ka -48.
-20b=48
Me tāpiri te 48 ki ngā taha e rua. Ko te tau i tāpiria he kore ka hua koia tonu.
b=\frac{48}{-20}
Whakawehea ngā taha e rua ki te -20.
b=-\frac{12}{5}
Whakahekea te hautanga \frac{48}{-20} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.
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