ROZWIĄZ RÓWNANIA
a) (x-5) (x+5) = (x-3)²
b) (2a-1)²= (2a+1) (2a-1)
c) (3x+2) (3x-2)-9(x+1)²= -22
d) 4x( 2-x)+ 12 = -(2x+6) (2x-6)
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a) (x-5)(x+5)=(x-3)²
x²+5x-5x-25=x²-6x+9
x²-x²+5x-5x+6x=9+25
6x=34 /: 6
x=5⁴/₆
x=5⅔
b) (2a-1)²=(2a+1)(2a-1)
4a²-4a+1=4a²-2a+2a-1
4a²-4a-4a²+2a-2a=-1-1
-4a=-2 / : (-4)
a=²/₄
a=½
c) (3x+2)(3x-2)-9(x+1)²=-22
9x²-6x+6x-4-9(x²+2x+1)=-22
9x²-6x+6x-4-9x²-18x-9=-22
9x²-6x+6x-9x²-18x=-22+9+4
-18x=-9 / : (-18)
x=⁹/₁₈
x=½
d) 4x(2-x)+12=-(2x+6)(2x-6)
8x-4x²+12=-(4x²-12x+12x-36)
8x-4x²+12=-4x²+12x-12x+36
8x-4x²+4x²-12x+12x=36-12
8x=24 / : 8
x=3