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1)5x²-9x=-4
5x²-9x+4=0
x=-(-9)₊₋√(9)²-4(5)(4)/2(5)
x=9₊₋√81-80/10
x=9₊₋√1/10
x=9₊₋1/10
x₁=+9+1=10/10=1
x₂=+9-1=8/10=0.8
Solución 2:
2):2x²-7x+3=0
x=-(-7)₊₋√(-7)²-4(2)(3)/2(2)
x=7₊₋√49-24/4
x=7₊₋√25/4
x=7₊₋5/4
x₁=7+5=12/4=3
x₂=7-5=2/4=0.5