Question

[Nguyễn Phương Linh]

1) Giair phương trình

a) \(\dfrac{2x+3}{5x-3}-\dfrac{3}{4x-6}=\dfrac{2}{5}\)

b) \(x^2+2x-15=0\)

c)\(x^3-4x^2+5x=0\)

d) \(4^x-10.2^x+16=0\)

e) x(x-1)(x-4)(x+5) = 84

Answer 1

[Nguyễn Lê Phước Thịnh]

b: =>(x+5)(x-3)=0

=>x=3 hoặc x=-5

c: \(\Leftrightarrow x\left(x^2-4x+5\right)=0\)

=>x=0

d: \(\Leftrightarrow2\cdot2^x-10\cdot2^x=-16\)

\(\Leftrightarrow-8\cdot2^x=-16\)

\(\Leftrightarrow2^x=2\)

hay x=1