Question

Please,now!!!!!!!!!!!!

Answer 1

a)3x+9≥3x+3+6
   3x+9≥3x+9 inecuatia nu are sens

b)5x+3≤4x-14+x+17
   5x+3≤5x+3 inecuatia nu are sens

c)5x+5<5x-5+10
   5x+5<5x+5 inecuatia nu are sens

d)3x+6<3x-3+9
   3x+6<3x+6 inecuatia nu are sens

e)2x²-12x+9≥x²-6x
   2x²-12x+9-x²+6x≥0
   x²-6x+9≥0
Δ=(-6)²-4·9
Δ=0 =>x₁=x₂≥3

f)2x²+10x+16≥x²+2x
  2x²+10x+16-x²-2x≥0
  x²+8x+16≥0
Δ=8²-4·16
Δ=64-64
Δ=0 =>x₁=x₂≥-4

g)x²-4>10x-29
   x²-4-10x+29>0
   x²-10x+25>0
Δ=(-10)²-4·25
Δ=100-100
Δ=0 =>x₁=x₂>5

h)x²-9>2x-10
   x²-9-2x+10>0
   x²-2x+1>0
Δ=(-2)²-4
Δ=4-4
Δ=0 =>x₁=x₂>1