Question

25x²+30x+9=0
gunakan persamaan kuadrat
beserta jalannya ​

Answer 1

25x² + 30x + 9 = 0

a = 25, b = 30, c = 9

Didapat:

[tex]\begin{aligned} \sf x &= \sf \frac{ - b \pm \sqrt{ {b}^{2} - 4ac} }{2a} \\ \sf &= \sf \frac{ - 30 \pm \sqrt{ {30}^{2} - 4(25)(9)} }{2(25)} \\ \sf &= \sf \frac{ - 30 \pm \sqrt{900 - 900} }{50} \\ \sf &= \sf \frac{ - 30 \pm \sqrt{0} }{50} \\ \sf &= \sf \frac{ - 30 \pm 0}{50} \\ \sf &= \sf - \frac{30}{50} \\ \sf x&= \sf - \frac{3}{5} \end{aligned}[/tex]