Ответ:
1.4-x²
A)x²-4=x²-2²=(x+2)(x-2)
2.9-a²
b)9-x²=3²-x²=(3+x)(3-x)
3.x²-y²
B)x²-y²=(x+y)(x-y)
4.y²-x²
г)(y-x)²=y²-2yx+x²
5.x²-4
D(2²-x²=(2+x)(2-x)
6.a²-9
E)x²-3²=(x+3)(x-3)
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Ответ:
1.4-x²
A)x²-4=x²-2²=(x+2)(x-2)
2.9-a²
b)9-x²=3²-x²=(3+x)(3-x)
3.x²-y²
B)x²-y²=(x+y)(x-y)
4.y²-x²
г)(y-x)²=y²-2yx+x²
5.x²-4
D(2²-x²=(2+x)(2-x)
6.a²-9
E)x²-3²=(x+3)(x-3)