a) x²-4x+4=0
(x-2)²=0
x-2=0
x=2
b)x²-9=0
(x-3)(x+3)=0
x-3=0 ∨ x+3=0
x=3 x=-3
c) 49 + 14x + x²=0
(7 +x)²=0
7+x=0
x=-7
d)0,25x²-1=0
(0,5x-1)(0,5x+1)=0
0,5x-1=0 ∨ 0,5x+1=0
x=2 x=-2
e)10x-x²-25x²=0
-x² +10x-25x²=0 /:(-1)
x² -10x +25x² =0
(x-5)²=0
x-5=0
x=5
f)25x²-81=0
(5x-9)(5x+9)=0
5x-9=0 ∨ 5x+9=0
x=9/5 x=-9/5
g)-16x=64x²+1
64x²+16x+1=0
(8x+1)²=0
8x+1=0
x=-1/8
h)-0,36x²+0,49=0
0,49 - 0,36x=0
(0,7-0,6x)(0,7+0,6x)=0
0,7-0,6x=0 ∨ 0,7 + 0,6x=0
-0,6x=-0,7 0,6x=-0,7
x=-7/10 *(-10/6) x=-7/10 * 10/6
x=7/6 x=-7/6
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a) x²-4x+4=0
(x-2)²=0
x-2=0
x=2
b)x²-9=0
(x-3)(x+3)=0
x-3=0 ∨ x+3=0
x=3 x=-3
c) 49 + 14x + x²=0
(7 +x)²=0
7+x=0
x=-7
d)0,25x²-1=0
(0,5x-1)(0,5x+1)=0
0,5x-1=0 ∨ 0,5x+1=0
x=2 x=-2
e)10x-x²-25x²=0
-x² +10x-25x²=0 /:(-1)
x² -10x +25x² =0
(x-5)²=0
x-5=0
x=5
f)25x²-81=0
(5x-9)(5x+9)=0
5x-9=0 ∨ 5x+9=0
x=9/5 x=-9/5
g)-16x=64x²+1
64x²+16x+1=0
(8x+1)²=0
8x+1=0
x=-1/8
h)-0,36x²+0,49=0
0,49 - 0,36x=0
(0,7-0,6x)(0,7+0,6x)=0
0,7-0,6x=0 ∨ 0,7 + 0,6x=0
-0,6x=-0,7 0,6x=-0,7
x=-7/10 *(-10/6) x=-7/10 * 10/6
x=7/6 x=-7/6