(a + b)² = a² + 2ab + b²
(a² - b²) = (a - b)(a + b)
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(c⁶+3)²-(с⁶-4)(с⁶+4) = (c⁶)² + 2*3*c⁶ + 3² - ((c⁶)² - 4²) = c¹² + 6c⁶ + 9 -c¹² + 16 = 6c⁶ + 25
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Verified answer
(a + b)² = a² + 2ab + b²
(a² - b²) = (a - b)(a + b)
----
(c⁶+3)²-(с⁶-4)(с⁶+4) = (c⁶)² + 2*3*c⁶ + 3² - ((c⁶)² - 4²) = c¹² + 6c⁶ + 9 -c¹² + 16 = 6c⁶ + 25