1) (5 - a)(5 + a)(25 + a²) = (25 - a²)(25 + a²) = 25² - a^4 = 625 - a^4
2) (3x + 2)(3x - 2)(9x² + 4) = (9x² - 4)(9x² + 4) = 9²x^4 - 4² =81x^4 - 16
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1) (5 - a)(5 + a)(25 + a²) = (25 - a²)(25 + a²) = 25² - a^4 = 625 - a^4
2) (3x + 2)(3x - 2)(9x² + 4) = (9x² - 4)(9x² + 4) = 9²x^4 - 4² =81x^4 - 16