Question

Хелп плес.----------------------
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Answer 1

3.
5m³+15m²=5m²(m+3)
a(a+c)-b(a+c)=(a+c)(a-b)
4x²-9y²=(2x-3y)(2x+3y)
3a²-6ab+3b²=3(a²-2ab+b²)=3(a-b)²
ax²-2ax+a=a(x²-2x+1)=a(x-1)²