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gulnaz0011
@gulnaz0011
July 2022
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m11m
Verified answer
1)
2(x²+3x)=x+7
2x²+6x-x-7=0
2x²+5x-7=0
D=5² - 4*2*(-7)=25+56=81=9²
x₁=(-5-9)/4= -14/4= -3.5
x₂=(-5+9)/4=1
Ответ: -3.5; 1.
2) x²-3x+7x=77
x²+4x-77=0
D=4² -4*(-77)=16+308=324=18²
x₁=(-4-18)/2= -22/2= -11
x₂=(-4+18)/2=14/2=7
Ответ: -11; 7.
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Answers & Comments
Verified answer
1)2(x²+3x)=x+7
2x²+6x-x-7=0
2x²+5x-7=0
D=5² - 4*2*(-7)=25+56=81=9²
x₁=(-5-9)/4= -14/4= -3.5
x₂=(-5+9)/4=1
Ответ: -3.5; 1.
2) x²-3x+7x=77
x²+4x-77=0
D=4² -4*(-77)=16+308=324=18²
x₁=(-4-18)/2= -22/2= -11
x₂=(-4+18)/2=14/2=7
Ответ: -11; 7.