Помогите с 4.84. а, б.

Question

Помогите с 4.84. а, б.

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Answer 1

√(7+4*√3)+√(7-4*√3)=√(2²+2*2*√3+(√3)²)+√(2²-2*2*√3+(√3)²)=
=√(2+√3)²+√(2-√3)²=2+√3+2-√3=4.

√(14+6*√5)+√(14-6*√5)=√(3²+2*3*√5+(√5)²)+√(3²-2*3*√5+(√5)²)=
=√(3+√5)²+√(3-√5)²=3+√5+3-√5=6.