Question

Determine a solução da equação x2 – x – 12 = 0 *


{2,4}

{3,6}

{4,2}

{4,-3}

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Answer 1

∆= b²-4×a×c

∆=1² -4×1×(-12)

∆=1 +48

∆=49

-b±√∆//2×a

x'= -1-√49 //2×1

x'= -1-7//2

x'= -8//2 ÷2= -4

-b±√∆//2×a

x"= -1+√49//2×1

x"= -1+7//2

x"= 6//2 ÷2= 3

S={-4,3}