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SaySasha02
@SaySasha02
August 2022
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Решите уравнение:
а) (5x+8)(9-x^2)=0 ;
б) x^4-2x^2-8=0
^- степень
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ПрофиЗнания
A) 5x+8=0
x=-8/5=-1 3/5
b) 9-x^2=0
9=x^2
x=3 x=-3
b)x^2=t
t²-2t-8=0
D=4+32=36
t1=(2+6)/2=8/2=4
t2=(2-6)/2=-4/2=-2
x²=4
x=2 x=-2
x²=-2
∅
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Answers & Comments
x=-8/5=-1 3/5
b) 9-x^2=0
9=x^2
x=3 x=-3
b)x^2=t
t²-2t-8=0
D=4+32=36
t1=(2+6)/2=8/2=4
t2=(2-6)/2=-4/2=-2
x²=4
x=2 x=-2
x²=-2
∅