Question

X²-x-20=0 ?qual e as raizes da equação?

Answer 1

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Answer 2

a=1 b=-1 c=-20
Δ= b² -4 .a.c
Δ=1+80
Δ=81

x=(-b +- √Δ )÷ 2.a
x=(1 +- 9 )÷2.1
x1=-8÷2=-4

x2=-10÷2=-5