W tym zadaniu korzystasz ze wzoru skróconego mnożenia:
(a-b)²=a²-2ab+b²
(x-5)²-(x-3)²=4(x-2)
(x²-10x+25)-(x²-6x+9)=4x-8
x²-10x+25-x²+6x-9=4x-8
-4x+16=4x-8
-8x= -24
x=3
(x-5)^2-(x-3)^2=4(x-2)
x^2- 10x+ 25- (x^2- 6x+9)= 4x- 8
x^2- 10x+ 25- x^2 +6x- 9= 4x- 8
-4x+ 16= 4x- 8
x= 3
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W tym zadaniu korzystasz ze wzoru skróconego mnożenia:
(a-b)²=a²-2ab+b²
(x-5)²-(x-3)²=4(x-2)
(x²-10x+25)-(x²-6x+9)=4x-8
x²-10x+25-x²+6x-9=4x-8
-4x+16=4x-8
-8x= -24
x=3
(x-5)^2-(x-3)^2=4(x-2)
x^2- 10x+ 25- (x^2- 6x+9)= 4x- 8
x^2- 10x+ 25- x^2 +6x- 9= 4x- 8
-4x+ 16= 4x- 8
-8x= -24
x= 3