Question

Aqui por favor !!!!!!!!!!!!

O valor de delta para a= 1,b = -1 e c= -2.

Answer 1

a= 1 b= -1 c= -2
Δ= b²-4ac
Δ= (-1)²-4·1·(-2)
Δ= 1-(-8)
Δ=9

Answer 2

Fórmula do Delta 
Δ=b²-4.a.c
a= 1,b = -1 e c= -2.
Δ=(-1)²-4.1.(-2)
Δ=1+8
Δ=9
Fórmula de Bhaskara  $x= \frac{-b+- \sqrt{\Delta}}{2.a}$

$x= \frac{1+- \sqrt{9} }{2.1} \\\\ x= \frac{1+-3}{2}\\\\ x'= \frac{1+3}{2}\\\\ x'= \frac{4}{2}\\\\ x'=2\\\\ x"= \frac{1-3}{2}\\\\ x"= \frac{-2}{2}\\\\ x"=-1 \\\\ V=\{2,-1\}$