(b – 5)(b + 5) (b² + 25) — (b² – 9)²
(b² – 25) (b² + 25) — (b² – 9)² = b^4 – 625 – b^4 + 18b² – 81 = 18b² – 706
1) b = -1
18b² – 706 = 18 · (-1)² - 706 = 18 · 1 - 706 = 18 - 706 = - 688
2) b = 3
18b² – 706 = 18 · (3)² - 706 = 18 · 9 - 706 = 162 - 706 = - 544
3) b =
18b² – 706 = 18 · ( )² - 706 = 18 · - 706 = 2 - 706 = - 704
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(b – 5)(b + 5) (b² + 25) — (b² – 9)²
(b² – 25) (b² + 25) — (b² – 9)² = b^4 – 625 – b^4 + 18b² – 81 = 18b² – 706
1) b = -1
18b² – 706 = 18 · (-1)² - 706 = 18 · 1 - 706 = 18 - 706 = - 688
2) b = 3
18b² – 706 = 18 · (3)² - 706 = 18 · 9 - 706 = 162 - 706 = - 544
3) b =
18b² – 706 = 18 · ( )² - 706 = 18 · - 706 = 2 - 706 = - 704