Question

Fie A multimea solutiilor reale a ecuatiilor 2x la a 2+5x-3=0

Answer 1

${2x}^{2} + 5x - 3 = 0$

$a = 2$

$b = 5$

$c = - 3$

$delta = {b}^{2} - 4ac$

$delta = {5}^{2} - 4 \times 2 \times ( - 3)$

$delta = 25 + 24$

$delta = 49$

$x(1.2) = \frac{ - b + - \sqrt{delta} }{2a}$

$x(1.2) = \frac{ -5 + - \sqrt{49} }{2 \times 2}$

$x(1.2) = \frac{ - 5 + - 7}{4}$

$x(1) = \frac{ - 5 + 7}{4} = \frac{2}{4} = \frac{1}{2}$

$x(2) = \frac{ - 5 - 7}{4} = - \frac{12}{4} = - 3$

$A = ( \frac{1}{2} , - 3)$