Question

Mohon bantuannya no 4

Answer 1

Verified answer

Jawab

Answer 2

→2√5-4 / 4+2√5
=(2√5-4)x(4-2√5) / -4
=2(√5-2)x2(2-√5) / -4
=(√5-2)x2(2-√5) / -2
=(√5-2)x(-1)x(2-√5)
=-(2-√5)x(-1)x(2-√5)
=-(2-√5)²x(-1)
= (2-√5)²
=(2-√5)(2-√5)
=4 - 2√5 - 2√5 + 5
=5+4 - 4√5
= 9 - 4√5
smga membantu.