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Class 10 > Learn Mathematics > What is the solution to the quadratic equation X^2...
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What is the solution to the quadratic equation X^2 - 18X + 81?

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so as we knew 9+9=18 & 9*9=81 it means we can write it like this or by taking common as follows we can write x(x+9)+9(x+9)=0 or (x+9)(x+9)=0 it means either x+9=0 or x+9=0 luckily both eqautions are same here so it means x=-9,-9 the solution or the roots are -9 & -9. By Rohit M.Sc. from Univeristy...
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so as we knew 9+9=18 & 9*9=81

it means we can write it like this 

or by taking common as follows we can write x(x+9)+9(x+9)=0

or (x+9)(x+9)=0

it means either x+9=0 or x+9=0 luckily both eqautions are same here

so it means x=-9,-9

the solution or the roots are -9 & -9.

By Rohit

M.Sc. from Univeristy of Delhi 

dm me @ insta " csirnetcoachingclass "

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X^2-9X-9X+81 X(X-9)-9(X-9) (X-9)(X-9)
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this is (x-9)^2=0 (x-9)=0 x=9
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