Question

( 1/5 + x  ) mũ 2 = 9/16  help me mai nộp cho cô mất rùi'

Answer 1

( 1/5 + x  )  mũ 2= 9/16

<=>(1/5+x)mũ 2=(3/4)mũ 2

=>1/5+x=3/4

<=>x=3/4-1/5

<=>x=11/20

vậy x=..............

Answer 2

\(\left(\frac{1}{5}+x\right)^2=\frac{9}{16}\)

<=>\(\left(\frac{1}{5}+x\right)^2-\left(\frac{3}{4}\right)^2=0\)

<=>\(\left(\frac{1}{5}+x-\frac{3}{4}\right)\cdot\left(\frac{1}{5}+x+\frac{3}{4}\right)=0\)

<=>\(\left(x-\frac{11}{20}\right)\cdot\left(x+\frac{19}{20}\right)=0\)

<=>\(\orbr{\begin{cases}x-\frac{11}{20}=0\\x+\frac{19}{20}=0\end{cases}}\)<=>\(\orbr{\begin{cases}x=\frac{11}{20}\\x=-\frac{19}{20}\end{cases}}\)

Vậy ...............

Answer 3

Thanks bạn