5 · (x – 2) = 5x–10.
15. – 2 · (3x – 9) = –6x+18.
9 · (6x – 5) = 54x–45.
x · (x – 2) = x2 –2x.
18. – 2x · (3x – 9) = 6x2 +18x.
9x2 · (6x – 5) = 54x3 –45x2.
5x · (x2+x – 2) = 5x3 +5x2 –10x.
21. ( 3x2 – 7x – 1) · (–4) · x5 = –12x7 +28x6 +4x5.
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5 · (x – 2) = 5x–10.
15. – 2 · (3x – 9) = –6x+18.
9 · (6x – 5) = 54x–45.
x · (x – 2) = x2 –2x.
18. – 2x · (3x – 9) = 6x2 +18x.
9x2 · (6x – 5) = 54x3 –45x2.
5x · (x2+x – 2) = 5x3 +5x2 –10x.
21. ( 3x2 – 7x – 1) · (–4) · x5 = –12x7 +28x6 +4x5.