Pls.solv3 by * completing the square method

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Btao phir mai karta hu
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4) An object of height 5 cm placed perpendicular to the principal axis of a concave lens of focal length 10
cm. H the distance of the object from the optical center is 20 cm. determine the position, nature and size
of the image formed using the lens formula.
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X_5;3
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Given, x^2?2x?15=0

x^2?5x+3x?15=0

x(x?5)+3(x?5)=0

(x?5)(x+3)=0

x=5,?3
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Kya karna hai
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