Question

resolva a equaçao do 2 grau em r : x2+2x-3=0

Answer 1

Por baskhara:

Δ = B² -4.a.c                                        

Δ = 2² -4 . 1 . -3

Δ = 4 + 12 

Δ = 16

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Logo, x =  -b + - √Δ/ 2.a

-2 +- √16 / 2.1

-2 +- 4 / 2
 
-2 +4 / 2 = 2/2 = 1
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-2-4 / 2 = -6/2 = -3 

    
 (S= 1, -3)