Tentukan hasil dari (3a-4) (5+2a) = 3a (5+2a)
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Jawaban:
-2,5
Penjelasan dengan langkah langkah:
[tex](3a - 4)(5 + 2a) = 3a(5 + 2a)[/tex]
[tex] = 7a + 6a {}^{2} - 20 = 3a(5 + 2a)[/tex]
[tex] = 7a + 6a {}^{2} - 20 = 15a + 6a {}^{2} [/tex]
[tex] = 7a + 6a {}^{2} - 20 - 15a = 6a {}^{2} [/tex]
[tex] = - 8 + 6a {}^{2} - 20 = 6a {}^{2} [/tex]
[tex] = - 8a + 6a {}^{2} - 20 - 6a {}^{2} = 0[/tex]
[tex] = - 8a - 20 = 0[/tex]
[tex] = - 8a = 20[/tex]
[tex] = a = \frac{20}{ - 8} [/tex]
[tex] = a = - \frac{5}{2} [/tex]
[tex] = - 2.5[/tex]
Kesimpulan jawabanya adalah: nilai a -2,5
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