(5+х)²= 10+2×5×x+x²=10+10x+x²
(1 – 3х)²= 1²-2×1×3x+9x²=1-6x+9x²
(3а – 5b)²=9a²-2×3a×5b+25b²=9a²-30ab+25b²
(х²+4)²= x²+2×x×4+16=x²+8x+16
(-2а+3b)²=4a²+2×(-2a)×3b+9b²=4a²-12ab+9b²
тут всё расписано
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(5+х)²= 10+2×5×x+x²=10+10x+x²
(1 – 3х)²= 1²-2×1×3x+9x²=1-6x+9x²
(3а – 5b)²=9a²-2×3a×5b+25b²=9a²-30ab+25b²
(х²+4)²= x²+2×x×4+16=x²+8x+16
(-2а+3b)²=4a²+2×(-2a)×3b+9b²=4a²-12ab+9b²
тут всё расписано