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Parokur
@Parokur
July 2022
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решите неравенство
10-3х²≤5х-2
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ТатМих
Verified answer
10-3х²≤5x-2
3x²+5x-2-10≥0
3x²+5x-12≥0
D=b²-4ac
D=25+144=169
√D=√169=13
x1=(-5+13)/6=8/6=4/3=1 1/3
x2=(-5-13)/6=-3
3(x-1 1/3)(x+3)≥0
x-1 1/3≥0
x+3≥0
x≥1 1/3
x≥-3
⇒
x≥1 1/3
x
-
1 1/3≤0
x+3≤0
x≤1 1/3
x≤-3
⇒
x≤-3
+ - +
////////////////-3...............1 1/3////////////////
Ответ: (- бесконечность;-3] и [1 1/3;+ бесконечность)
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Answers & Comments
Verified answer
10-3х²≤5x-23x²+5x-2-10≥0
3x²+5x-12≥0
D=b²-4ac
D=25+144=169
√D=√169=13
x1=(-5+13)/6=8/6=4/3=1 1/3
x2=(-5-13)/6=-3
3(x-1 1/3)(x+3)≥0
x-1 1/3≥0
x+3≥0
x≥1 1/3
x≥-3
⇒
x≥1 1/3
x-1 1/3≤0
x+3≤0
x≤1 1/3
x≤-3
⇒
x≤-3
+ - +
////////////////-3...............1 1/3////////////////
Ответ: (- бесконечность;-3] и [1 1/3;+ бесконечность)