Ответ:-8x(x - 10) - 155
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Ответ:
-8x(x-10) - 155
Объяснение:
(x+4)^2 - 9(x-4)^2
по формуле (a+b)^2 = a^2 + 2ab + b^2 и (a-b)^2 = a^2 - 2ab + b^2:
x^2 + 2 * 4x + 16 - 9(x^2 - 2*4x + 16) = x^2 + 8x + 16 - 9x^2 + 72x + 171 = -8x^2 + 80x - 155 = -8x(x - 10) - 155
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Ответ:-8x(x - 10) - 155
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Verified answer
Ответ:
-8x(x-10) - 155
Объяснение:
(x+4)^2 - 9(x-4)^2
по формуле (a+b)^2 = a^2 + 2ab + b^2 и (a-b)^2 = a^2 - 2ab + b^2:
x^2 + 2 * 4x + 16 - 9(x^2 - 2*4x + 16) = x^2 + 8x + 16 - 9x^2 + 72x + 171 = -8x^2 + 80x - 155 = -8x(x - 10) - 155