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Question

(a+b)² = ?

$a^{2} - 2 a b + b^{2}$

(a+b)(a-b)

${(a - b)}^{2} + 4 a b$

${(a + b)}^{2} - 4 a b$

ANSWER : 3

Descrption

<figure class="table"><table style=";"><tbody><tr><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;">(ক)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right-style:none;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;"><i>a</i><sup>2</sup> – 2<i>ab</i> + <i>b</i><sup>2</sup></td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right-style:none;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;">=&nbsp;</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right-style:none;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;">(<i>a</i> – <i>b</i>)<sup>2</sup>&nbsp;</td></tr><tr><td style="border-bottom-style:none;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;">(খ)</td><td style="height:14.15pt;padding:0cm 5.4pt;">(<i>a</i> + <i>b</i>)(<i>a</i> – <i>b</i>)</td><td style="height:14.15pt;padding:0cm 5.4pt;">=</td><td style="height:14.15pt;padding:0cm 5.4pt;"><i>a</i><sup>2</sup><i> – b</i><sup>2</sup></td></tr><tr><td style="border-bottom-style:none;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;">(গ)</td><td style="height:14.15pt;padding:0cm 5.4pt;">(<i>a</i> – <i>b</i>)<sup>2</sup> + 4<i>ab</i></td><td style="height:14.15pt;padding:0cm 5.4pt;">=</td><td style="height:14.15pt;padding:0cm 5.4pt;">(<i>a</i> + <i>b</i>)<sup>2</sup></td></tr><tr><td style="border-bottom-style:none;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;height:14.15pt;padding:0cm 5.4pt;">(ঘ)</td><td style="height:14.15pt;padding:0cm 5.4pt;">(<i>a</i> + <i>b</i>)<sup>2</sup> − 4<i>ab</i></td><td style="height:14.15pt;padding:0cm 5.4pt;">=</td><td style="height:14.15pt;padding:0cm 5.4pt;">(<i>a</i> – <i>b</i>)<sup>2</sup></td></tr></tbody></table></figure>

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