Объяснение:
а) (2х–1)(3х+4) = 5х–1
6х²+8х–3х–4 = 5х–1
6х²+5х–4–5х+1 = 0
6х²–3 = 0
б) х(х+3) – 7х = 12
х²+3х–7х = 12
х²–4х–12 = 0
в) (х–6)² = 21–4х
х²–12х+36–21+4х = 0
х²–8х+15 = 0
Объяснение:
а) (2х–1)(3х+4) = 5х–1
6х²+8х–3х–4 = 5х–1
6х²+5х–4–5х+1 = 0
6х²–3 = 0
б) х(х+3) – 7х = 12
х²+3х–7х = 12
х²–4х–12 = 0
в) (х–6)² = 21–4х
х²–12х+36–21+4х = 0
х²–8х+15 = 0