Question

Tìm X

a) ( X - 3)² = ( X - 3)⁴

b) 3 × 2^X+1 + 2^X+2=40

Giải rõ họ mik nha😆😆😆

Answer 1

Ta có: (X-3)²=(X-3)⁴

=>X-3)⁴-(X-3)²=0

=>(X-3)².(X-3.X-3-1)=0

=>(X-3)²= 0 hoặc X-3.X-3-1=0

Suy ra x=3;4

b, 3.(2^x+1)+2^x+2

=3.2^x+1+2^x+1.2

=2^x+1.(3+2)

=2^x+1.5=40

=2^x+1=40:5=8

=2^x+1=2³

=>x+1=3

=>x=3-1=2

=> là suy ra nha bạn

Answer 2

a) ( X - 3 ) ² = ( X - 3 )⁴ <=> X - 3 =1

                                       => X = 1+3

                                       => X = 4

Chú thích <=> : khi và chỉ khi

                   => : suy ra

b) Mình k^o biết ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________-sorry-____________________________________________________________________________________________________________________________________-__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Answer 3

a)x=4 vi neu nhu x<4 thi x^2>x^4, con neu x>4 thi X^2<x^4

b minh chua biet lam