Question

x²+3x-28=0,como calcular a equação?

Answer 1

Δ=b²-4ac
Δ=9+112
Δ=121

√121=11
x= - b + - 11/2a
x1= (-3 +11)/2 = 4
x2= (- 3 - 11) / 2 = - 7 

Answer 2

x²+3x-28=0
Delta= 9+112
Delta= 121

x= -3+-11/2

x'=-3-11/2
x'= -7

x''= -3+11/2
x''= 4

S={-7,4}