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jokkyfly
@jokkyfly
July 2022
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Разложите на множители трехчлен:
а) х (в 4-ой степени) - 47 х (во второй степени) - 98
б) х ( в 4-ой степени) - 85 (во второй степени) + 1764
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Света19999
Verified answer
1) x^4 - 47x^2 - 98 = (x^2 - 49)(x^2 + 2) = (x-7)(x+7)(x^2+2)
D = 47^2 + 4*98 = 2601 = 51^2
x1^2 = (47+51)/2 = 49
x2^2 = (47-51)/2 = -2
2)x^4 - 85x^2 + 1764 = (x^2 - 49)(x^2 - 36) = (x-7)(x+7)(x-6)(x+6)
D = 7225 - 7025 = 169 = 13^2
x1^2 = (85 + 13)/2 = 49
x1^2 = (85 - 13)/2 = 36
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Answers & Comments
Verified answer
1) x^4 - 47x^2 - 98 = (x^2 - 49)(x^2 + 2) = (x-7)(x+7)(x^2+2)D = 47^2 + 4*98 = 2601 = 51^2
x1^2 = (47+51)/2 = 49
x2^2 = (47-51)/2 = -2
2)x^4 - 85x^2 + 1764 = (x^2 - 49)(x^2 - 36) = (x-7)(x+7)(x-6)(x+6)
D = 7225 - 7025 = 169 = 13^2
x1^2 = (85 + 13)/2 = 49
x1^2 = (85 - 13)/2 = 36