Rozwiąż równania.
a) 7(2x-1)-6(11-x)=3(x+4)
b) (x+5) (x+2)-3(4x-3)=(x-5)²
a)
7(2x-1)-6(11-x) = 3(x+4)
14x-7-66+6x = 3x+12
20x-73 = 3x+12
20x-3x = 12+73
17x = 85 |:17
x = 5
b)
(x+5)(x+2)-3(4x-3) = (x-5)²
x²+2x+5x+10-12x+9 = x²-10x+25
x²-5x+19 = x²-10x+25 |-x²
-5x+19 = -10x+25
-5x+10x = 25-19
5x = 6 |:5
x = 1,2
b) x(kwadrat)+2x+5x+10-12x+9=x(kw.)-2x5+25
x(kw)-5x+19=x(kw)-10x+25 /+10x
x(k)+5x+19= x(k)+25 / -19
x(k)+5x = x(k) +6
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a)
7(2x-1)-6(11-x) = 3(x+4)
14x-7-66+6x = 3x+12
20x-73 = 3x+12
20x-3x = 12+73
17x = 85 |:17
x = 5
b)
(x+5)(x+2)-3(4x-3) = (x-5)²
x²+2x+5x+10-12x+9 = x²-10x+25
x²-5x+19 = x²-10x+25 |-x²
-5x+19 = -10x+25
-5x+10x = 25-19
5x = 6 |:5
x = 1,2
a)
7(2x-1)-6(11-x) = 3(x+4)
14x-7-66+6x = 3x+12
20x-73 = 3x+12
20x-3x = 12+73
17x = 85 |:17
x = 5
b)
(x+5)(x+2)-3(4x-3) = (x-5)²
x²+2x+5x+10-12x+9 = x²-10x+25
x²-5x+19 = x²-10x+25 |-x²
-5x+19 = -10x+25
-5x+10x = 25-19
5x = 6 |:5
x = 1,2
b) x(kwadrat)+2x+5x+10-12x+9=x(kw.)-2x5+25
x(kw)-5x+19=x(kw)-10x+25 /+10x
x(k)+5x+19= x(k)+25 / -19
x(k)+5x = x(k) +6