Hasil pemangkatan dari (4x - 5y)²

<p>Jawaban yang tepat adalah <strong>16x² - 40xy &nbsp;+ 25y²</strong></p><p>&nbsp;</p><p><strong>Pembahasan </strong>:</p><p>(4x - 5y)² = (4x - 5y)(4x - 5y)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 16x² - 20xy - 20xy &nbsp;+ 25y²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= &nbsp;16x² - 40xy &nbsp;+ 25y²</p><p>&nbsp;</p><p>atau menggunakan rumus selisih kuadrat sempurna</p><p>(a - b)² = a² - 2ab + b²</p><p>(4x - 5y)² = (4x)² -2(4x)(5y) + (5y)²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 16x² - 40xy &nbsp;+ 25y²</p>