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7. aratati ca a= -3 este solutia (2x+1)²-(1-x)²+1=4-2x
8. x²+(x+1)²+(x-1)²=(x+2)²+(x-2)²+3
9. 4·(2x-5)²-(3x+1)²=0
10. 3(2x+1)²=√(√5-3)²+√(21+4√5)-√(√5-2)²
11.2(x+2)²-11=61