Ответ:
Пошаговое объяснение:
[tex]1)\\x^{2} +5x+6=0\\D=b^{2} +4ac\\D=25+4*6\\D=1\\x1=\frac{-5+1}{2} = -2\\x2=\frac{-5-1}{2} =-3\\\\2)\\x^{2} +3x-3x -9=x^{2} -9=16\\x^{2} =25 \\x=5\\3)\\36x^{2} -24x+4=4(3x-1)^{2} \\\\\\\\4)\\x^{2} -7x-8=(x+1)(x-8)\\\\5)\\x^{2} -9x-10=0\\D=81-4*(-10)\\D=121\\X1=\frac{9+11}{2} =10\\X2=\frac{9-11}{2}=-1\\x1+x2=10-1=9\\6)\\-15\\7)\\4x^{2} -5x+1=(x-1)(4x-1)[/tex]
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Answers & Comments
Ответ:
Пошаговое объяснение:
[tex]1)\\x^{2} +5x+6=0\\D=b^{2} +4ac\\D=25+4*6\\D=1\\x1=\frac{-5+1}{2} = -2\\x2=\frac{-5-1}{2} =-3\\\\2)\\x^{2} +3x-3x -9=x^{2} -9=16\\x^{2} =25 \\x=5\\3)\\36x^{2} -24x+4=4(3x-1)^{2} \\\\\\\\4)\\x^{2} -7x-8=(x+1)(x-8)\\\\5)\\x^{2} -9x-10=0\\D=81-4*(-10)\\D=121\\X1=\frac{9+11}{2} =10\\X2=\frac{9-11}{2}=-1\\x1+x2=10-1=9\\6)\\-15\\7)\\4x^{2} -5x+1=(x-1)(4x-1)[/tex]