Question

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Answer 1

A) x²-6x+9=49

x²-6x-40=0

Δ=36+ 160

Δ=196

x=6±√196/2

x=6±14/2

x1= 6 +14/2; 20/2=10

x2=6-14/2; -8/2= -4

B) x² +2x+1=100

x²+2x-99=0

Δ=4+ 396

Δ=400

x=-2±√400/2

x=-2±20/2

x1= -2-20/2; -22/2=-11

x2=-2+20/2; 18/2=9

C)4x²-36x+81=9

4x²-36x+72

Δ=1296-1152

Δ=144

x=36±√144/8

x=36±12/8

x1=36+12/8; 48/8=6

x2=36-12/8; 24/8=3

D) 9x²+30x+25=-16

9x²+30x+41

Δ=900-1476

Δ=-576

NÃO TEM SOLUÇÃO REAL