Po rozłożeniu na czynniki pierwsze wyrażenie;
4 (x-y)^2-9 ( nawias do kwadratu)
ma postać :
proszęęęo pomos :))
korzystamy ze wzoru a²-b²=(a+b)(a-b)
4(x-y)²-9=2²(x-y)²-3²=[2(x-y)-3][2(x-y)+3]=
=(2x-2y-3)(2x-2y+3)
nasze a=2(x-y)
b=3
4(x - y)² - 9 =
[ 2(x - y) ]² - 3² =
[ 2(x - y) - 3 ] [ (2(x - y) + 3] = (2x - 2y - 3)(2x - 2y + 3)
wzór:
a² - b² = (a - b)(a +b)
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korzystamy ze wzoru a²-b²=(a+b)(a-b)
4(x-y)²-9=2²(x-y)²-3²=[2(x-y)-3][2(x-y)+3]=
=(2x-2y-3)(2x-2y+3)
nasze a=2(x-y)
b=3
4(x - y)² - 9 =
[ 2(x - y) ]² - 3² =
[ 2(x - y) - 3 ] [ (2(x - y) + 3] = (2x - 2y - 3)(2x - 2y + 3)
wzór:
a² - b² = (a - b)(a +b)