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b) 49x⁴-36x²=(7x²)²-(6x)²=(7x²+6x)(7x²-6x)
c) 1-x²=(1+x)(1-x)
d) 9x⁶-x⁸=(3x³)²-(x⁴)²=(3x³+x⁴)(3x³-x⁴)