Odpowiedzi

2009-12-15T19:43:37+01:00
A) (x+3)²=x²+6x+9
b) (a-2)²=a²-4a+4
c) (2x+5)²=4x²+20x+25

albo

a) (x+3)²=(x+3)(x+3)
x=-3
b) (a-2)²=(a-2)(a+2)
a=-2 v a=2
c) (2x+5)²=(2x+5)(2x+5)
x=2/5
2009-12-15T19:48:47+01:00
A) (x+3)²=x²+2*x*3+9=x²+6x+9
b) (a-2)²=a²-2*a*2+4=a²-4a+4
c) (2x+5)²=4x²+2*2x*5+25=4x²+20x+25
2009-12-15T19:48:13+01:00
A) x² + 2x * 3 + 3² = 2x² * 12
b) a² - 2a * 2 + 2² = a² - 2a * 6
c) 2x² + 2 * 2x * 5 + 5² = 2x² + 2 * 2x * 30