Wzory skróconego mnożenia:
(a+b)²=a²+2ab+b² - kwadrat sumy;
(a-b)²=a²-2ab+b² - kwadrat różnicy;
a²-b²=(a-b)(a+b) - różnica kwadratów;
======================================
(x-3)^2+x-2=(x-2)(x+2)+3x+1
x²-6x+9+x-2=x²-4+3x+1
-5x-3x=-3-7
-8x=-10
x=10/8
x=5/4
-6x-2x=-4x+3x+1
-6x-2x+4x-3x=1
-7x=1/:7
x=-0,14
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Wzory skróconego mnożenia:
(a+b)²=a²+2ab+b² - kwadrat sumy;
(a-b)²=a²-2ab+b² - kwadrat różnicy;
a²-b²=(a-b)(a+b) - różnica kwadratów;
======================================
(x-3)^2+x-2=(x-2)(x+2)+3x+1
x²-6x+9+x-2=x²-4+3x+1
-5x-3x=-3-7
-8x=-10
x=10/8
x=5/4
-6x-2x=-4x+3x+1
-6x-2x=-4x+3x+1
-6x-2x+4x-3x=1
-7x=1/:7
x=-0,14