Question

me ajudem por favor !!!!!!!​

Answer 1

$1)2x ^{2} + 3x + 1=$

$a=2 \\ b=3 \\ c=1$

$x= \frac{ - 3± \sqrt{ {3}^{2} - 4 \times 2 \times 1 } }{2 \times 2}$

$x= \frac{ -3 \: ± \sqrt{1} }{4}$

$x= \frac{ - 3±1}{4}$

$x,= \frac{ - 3 + 1}{4} = \frac{ - 2}{4} = - \frac{1}{2}$

$x,,= \frac{ - 3 - 1}{4} = \frac{ - 4}{4} = - 1$

S={ -1/2,-1}

$2)x ^{2} - 18x + 45=0 \\ a = 1 \\ b = - 18 \\ c = 45$

$x = - ( - 18)± \frac{ \sqrt{( - {18}^{2}) - 4 \times 1 \times 45 } }{2 \times 1}$

$x = \frac{18± \sqrt{324 - 180} }{2}$

$x = \frac{18± \sqrt{144} }{2}$

$x = \frac{18±12}{2}$

$x, = \frac{18 + 12}{2} = \frac{30}{2} = 15$

$x,, = \frac{18 - 12}{2} = \frac{6}{2} = 3$

S={3,15}