Question

Resolva-(X+3)•(2X-1)=

(2y-3)•(y+4)=

(X-5)•(4X-2) Me ajudem,com conta pfv

Answer 1

Resposta:

(×+3)(2×-1)=s{11,27/2}

(2y-3)(y+4)=s{3/2,4}

(×-5)(4×-2)=s{23,-35/2}

Explicação passo-a-passo:

(×+3).(2×-1)

2ײ-×+6×-3

2ײ+5×-3

∆=5²-4.2.(-3)

∆=25+24

∆=49

×=-5±49/2.2

×=-5±49/4

×'=-5+49=44/4=11

×"=-5-49=-54/4 :2= 27/2

(2y-3).(y+4)

2y²+8y-3y-12

2y²+5y-12

∆=5²-4.2.12

∆=25+96

∆=121

y=-5±√121/2.2

y=-5±11/4

y'=-5+11=6/4 :2=3/2

y"=-5-11=16/4=4

(×-5).(4×-2)

4ײ-2×-20×+10

4ײ-22×+10 :(2)

2ײ-11×+5

∆=(-11)²-4.2.5

∆=121-40

∆=81

×=-(-11)±√81/2.2

×=11±81/4

×'=11+81=92/4=23

×"=11-81=-70/4 :2=-35/2

Espero ter ajudado, bons estudos!