Question

${x}^{2} - 17x + 72 = 0$
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Answer 1

x² -17x +72 =0 ==> -17/72= -8-9/-8•-9

(x -8). (x -9)=0

x'=8. x"=9 <======©

Answer 2

Explicação passo-a-passo:

x²-17x+72=0

a=1

b=-17

c=72

∆=b²-4.a.c

∆=(-17)²-4.(1).(72)

∆=289-288

∆= 1

x'=[-(-17)+√1]/2.(1)

x'=(17+1)/2

x'=18/2

x'=9

x"=[-(-17)-√1]/2

x"=[17-1]/2

x'=16/2

x"=8

Resposta :

S={( 8 : 9)}