Решите уравнения:
1) (х-5)²+4х=25
2) (х+6)(х-7)= - х + 7
3) 6х(0.5 +3х) - 15х² = 0
4) (4 - х)(4+х) = х² - 2
1) (х-5)²+4х=25
2) (х+6)(х-7)= - х + 7
3) 6х(0.5 +3х) - 15х² = 0
4) (4 - х)(4+х) = х² - 2
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Answers & Comments
x^2-6x=0
x(x-6)=0
X1=0,X2=6
2) x^2-7x+6x-42+x-7=0
x^2-49=0
X1=7; X2=-7.
3) 3x+18x^2-15x^2=0
3x^2+3x=0
3x(x+1)=0
X1=0; X2=-1.
4)16-x^2-x^2+2=0
18-2x^2=0
2(9-x^2)=0\2
9-x^2=0
X1=3; X2=-3
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