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51-y(3y+4)=2(17-2y)-58
51-3y²-4y=34-4y-58
51-3y²-4y=-24-4y /+4y
51-3y²=-24 /-51
-3y²=-75 /:(-3)
y²=25
y=5(bo 5²=25
c)
(2+5x)^2=19x+(x-4)(x+5)
4+10x=19x+x²-20 /-10x
4=9x+x²-20
d)
25(x-1)^2 -9(x+2)^2=0
25x-25*2-9x-18*2=0
16x-50-36=0
16x-86=0 /+86
16x=86 /:16
x=5,375
e)3x^2-2√3x-3=0
6x-√12 *x-3=0
6x²-√12 -3=0 /+√12