1)b²-9=b²-3²=(b-3)(b+3)
2)x²-10x+25=x²-2•5•x+5²=(x-5)²
3)m³+27=m³+3³=(m+3)(m²-3m+9)
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1)b²-9=b²-3²=(b-3)(b+3)
2)x²-10x+25=x²-2•5•x+5²=(x-5)²
3)m³+27=m³+3³=(m+3)(m²-3m+9)