Math, asked by vnkjls, 10 months ago

5^(x+1) + 5^(2-x) + 1 find the roots by factorisation​

Answers

Answered by rachitsainionline
1

See the answer Below Mate:-

=>5^(^x^+^1^)+5^(^2^-^x^) = 126

Solving, The equation :-

=>5^x(5)+5^2(5^-^x)=126

=>5^x(5)+\frac{25}{5^x}=126

=>5y+\frac{25}{y}=126                           .........(∵Let 5^x=y)

=>5y^2+25=126y

=>5y^2-126y+25=0

=>5y^2-125y-y+25=0

=>5y(y-25)-1(y+25)=0

=>(y-25)(5y-1)=0

=>y=25 or y=\frac{1}{5}

                                                                                                           

=>Then,

y=5^x

5^x=25

5^x=5^2

x=2                                            ............................(∵Bases are same)

                                     &

=>Then,

5^x=5^-^1

x=-1                                             ............................(∵Bases are same)

                                                                                                             

=>Hence,x=2

or            x=-1

Answered by Rishail6845
0

Answer:

=>Hence,x=2

or            x=-1

Step-by-step explanation:

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