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a) (x+2)²=x²+4+4x
b) (1+x)²=x²+1+2x
c) (3a+5)²=9a²+25+30a
d) (x+1)²=x²+1+2x
2. Oblicz sprytnie
WZÓR: (a-b)(a+b)=a²-b²
a) (x-3)(x+3)= x²-9
b) (x²-2)(x²+2)= - 4
c) (2b+1)(2b-1)=4b²-1
3. Rozłóż wyrażenia na czynniki
a) x²-4= (x-2)(x+2)
b) -3+9x²= (3x-√3)(3x+√3)
c) x²-16= (x+4)(x-4)
d) x²-2= (x+√2)(x-√2)
4.Wyznacz niewiadomą z proporcji
a) x/7 = 3/28
28x=7·3
x=21/28
x=3/4
b) 2a-4/a+3= 3/4 / · a
2a²-4+3a= 3/4a
2a²+3a - 3/4a - 4= 0
2a²+2 a - 4= 0
Δ= ()²-4·2·-4
Δ= +32
Δ=32
√Δ=√37
x1= -9/4 + √37 /4
x2= -9/4 - √37 /4
c)az-3/4 / 2,5=1 1/4
az - · =
az = + ·
az = + ·
az = +
az = +
az =
a = /z
zaraz dokończę :)