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(y+4) (y²+4y+16)
= y(y²+4y+16)+4(y²+4y+16)
= y³+4y²+16y+4y²+16+64
= y³+8y⁴+16y+80
No 7:
(5x-y) (25x²-5xy+y²)
= 5x(25x²-5xy+y²)-y(25x²-5xy+y²)
= 125x³-25x²y+5xy²-25x²y+5xy²-y³
= 125x³-50x⁴y+10xy⁴-y³