Question

Solve each equations using the quadratic formula. X²-9x+20=0
Help me can you please

Answer 1

Answer:

$x=5 \\ x=4$

Step-by-step explanation:

$x ^ { 2 } -9x+20=0$

$x = \frac{ - b \: ± \: \sqrt{ {b}^{2} - 4ac } }{2a}$

$x=\frac{-\left(-9\right)±\sqrt{\left(-9\right)^{2}-4\times 20}}{2}$

$x=\frac{-\left(-9\right)±\sqrt{81-4\times 20}}{2}$

$x=\frac{-\left(-9\right)±\sqrt{81-80}}{2}$

$x=\frac{-\left(-9\right)±\sqrt{1}}{2}$

$x=\frac{-\left(-9\right)±1}{2}$

$x=\frac{9±1}{2}$

$x=\frac{10}{2} = 5$

$x=\frac{8}{2} = \: 4$

hence,

$x=5 \\ x=4$