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sansanma1
@sansanma1
August 2022
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при каких значения переменной значение выражения а) 4x^2 - 21x + 20 равно -7
б) 9x^2 +9x +4 равно 2
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nafanya2014
Verified answer
А) 4x² - 21x + 20= -7
4x² - 21x + 27= 0
D=(-21)²-4·4·27=441-432=9=3²
x=(21-3)/8=9/4=2,25 или х=(21+3)/8=3
б) 9x²+9x +4= 2
9x²+9x +2= 0
D=9²-4·9·2=81-72=9=3²
x=(-9-3)/18=-2/3 или х=(-9+3)/18=-6/18=-1/3
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Answers & Comments
Verified answer
А) 4x² - 21x + 20= -74x² - 21x + 27= 0
D=(-21)²-4·4·27=441-432=9=3²
x=(21-3)/8=9/4=2,25 или х=(21+3)/8=3
б) 9x²+9x +4= 2
9x²+9x +2= 0
D=9²-4·9·2=81-72=9=3²
x=(-9-3)/18=-2/3 или х=(-9+3)/18=-6/18=-1/3