Question

помогите решить
1) 3x^2-12=0
2) x^2-3x=0
3)-7x^2=0
4) 4x^2-25=0
5)3x^2=-2x
6)-1=9x^2-1
7)x^2-4x+4=0
8) 7x+3=2x^2+3x+3
9)(2x-9)(x+1)=(x-3)(x+3)
10)x^2-(2x-3)(1-x)=3

Answer 1

1)3x^2-12=0
3x^2=-12
x^2=-12÷(-3)
x^2= 4
x=2
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