Question

me falem qual é a resposta disso 2ײ-3×-5=0​

Answer 1

$\boxed{\begin{array}{lr} 2x^2-3x-5=0 \end{array}}$

a = 2

b = -3

c = -5

$\boxed{\begin{array}{lr} \Delta=b^2-4.a.c\\\Delta=(-3)^2-4.2.-5\\\Delta=9+40\\\Delta=49 \end{array}}$

$x=\dfrac{-b\pm\sqrt{\Delta}}{2.a}\\\\\\x=\dfrac{3\pm7}{2.2}\\\\\\x=\dfrac{3\pm7}{4}\\\\\\x'=\dfrac{3+7}{4}\\\\\\x'=\dfrac{10}{4}\\\\\\x'=2.5\\\\-------\\\\x''=\dfrac{3-7}{4}\\\\\\x''=\dfrac{4}{4}\\\\\\x''=1$

$S=\{2.5 \ , \ 1\}$