4*(pierwiastek z 7 +2)-5*(-4pierwiastek z 7+2)
4·(√7+2)-5·(-4√7+2)=
√28+8-(20√7-10)=
√28+8-20√7+10=
2√7-20√7+18=
18-18√7=
18(1-√7)
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4·(√7+2)-5·(-4√7+2)=
√28+8-(20√7-10)=
√28+8-20√7+10=
2√7-20√7+18=
18-18√7=
18(1-√7)