Umas das equaçoes abaixo tem as raizes 2 e 3 Qual e

Umas das equaçoes abaixo tem as raizes 2 e 3 Qual e

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    Substituindo o x pelas razes 2 e 3;

    x + 5x + 6 = 0
    2 + 5(2)+6 = 4+ 16 = 20 <--- no serve
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    -x — 5x -6 = 0
    -(2) — 5(2) — 6 = -4 -10 -6 = -20 <-- no serve
    ___________________________________________________
    2x — 5x + 6 = 0
    2(2) — 5(2) + 6 = 8 -10 +6 = -4 <--- no serve
    _______________________________________________
    — x + 5x — 6 = 0
    — 2 + 5(2) — 6 = -4 +10-6 = 0 <---a raiz 2 serve— 3 + 5(3) -6 = 0
    — 9 + 15 — 6 = 0 <--- a raiz 3 serveA ltima equao a verdadeira

  • -x+5x-6=0
    = b-4ac
    = (-5)-4(-1).(-6)
    = 25 — 24
    = 1

    -b +- / 2.-a

    -5-1/-2 = -6/-2 = 3

    -5+1/-2 = -4/-2 = 2


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