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2/5x+10=-3/ x^2-4
2*(x^2-4)=-3*(5x+10)
2x^2-8=-15x-30
2x^2+15x +22=0
delta=225-4*2*22=49
√delta=7
x1=-15-7 / 4=-22/4=-5,5
x2=-15+7 /4=-2
b
2x+5 / x^2-1=1/ x+1
x^2-1=( 2x+5)* (x+1)
x^2-1=2x^2+2x+5x+5
-x^2-7x -6=0
delta= 49-4*(-6)*(-1)=25
√delta=5
x1=7-5/ -2=-1
x2= 7 +5 / -2= - 6
e
6/x -1= 2 / x-1
6/x - x/x= 2 / x-1
6-x / x = 2 / x-1
2x= (6-x)*(x-1)
2x=6x-6 -x^2 +x
x^2 +2x -7x +6=0
x^2-5x+6=0
delta= 25-4*1*4=9
√delta=3
x1= 5-3/2=1
x2= 5 +3 / 2= 4
2x²-8=-15x-30
2x²+15x+22=0
Δ=b²-4ac
Δ=225-4×2×22
Δ=√49
Δ=7
x1=-15-7/2*2=-22/4=-5 1/2
x2=-15+7/2*2=-8/4= -2
b) (2x+5)(x+1)=x²-1
2x²+2x+5x+5-x²+1=0
x²+7x+6=0
Δ=b²-4ac
Δ=49-4*1*6
Δ=49-24
Δ=√25
Δ=5
x1=-7-5/2=-12/2=-6
x2=-7+5=-2/2=-1
c)Całe działanie mnożysz razy (1-x) i (x-1)
(x-1) + (1-x) = -x²+2x-1
-x²+2x-1=0
Δ=4-4*(-1)*(-1)
Δ=√4
Δ=2
x1=-2-2/-2=-4/-2=2
x2=0/-2=0