Question
यदि ${( - 7 - 24i)^{1/2}} = x - iy,$ तो ${x^2} + {y^2} = $
दोनों पक्षों का वर्ग करने पर, $ - 7 - 24i = {x^2} - {y^2} - i(2xy)$
वास्तविक एवं काल्पनिक भागों की तुलना करने पर,
${x^2} - {y^2} = - 7$एवं $2xy = 24$
$\therefore \,\,\,{x^2} + {y^2} = \sqrt {49 + 576} = \sqrt {625} = 25$
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