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♦²=4x²
√♦²=√4x²
♦=2x
-♣x=-2♦*x
x=2♦
x=2*2x
x=4x
♠=√2²
♠=2
2)
(a+b)²=(-a-b)²
a²+2ab+b²=(-a-b)(-a-b)
a²+2ab+b²=a²+ab+ab+b²
a²+2ab+b²=a²+2ab+b²
równość jest prawdziwa
3)
(a-b)³=(a-b)²*(a-b)=(a²-2ab+b²)(a-b)=
a³-a²b-2a²b+2ab²+ab²-b³=a³-3a²b+3ab²-b³
4)
½x²+3=½(x-2)² /*2
x²+3=x²-4x+4
4x=1 /:4
x=¼