Jawaban:
j.
[tex](3 \sqrt{5} \times 3 \sqrt{5}) - ( \sqrt{3} \times 3 \sqrt{5)} + \sqrt{3} [/tex]
[tex] = 45 - 3 \sqrt{15} + \sqrt{3} [/tex]
k. gunakan sifat (a+b)(a-b) = a^2-b^2
[tex](3 \sqrt{2} \times3 \sqrt{2)} - (2 \sqrt{5} \times 2 \sqrt{5}) [/tex]
[tex] = 18 - 20 = - 2[/tex]
l.
[tex]( \sqrt{7} + \sqrt{2})( \sqrt{7} + \sqrt{2}) [/tex]
[tex] = 7 + 2 \sqrt{14} + 2 = 9 + 2 \sqrt{14} [/tex]
Penjelasan dengan langkah-langkah:
[tex]a \sqrt{b} \times a \sqrt{b} ={a}^{2} \times b [/tex]
[tex] \sqrt{a} \times \sqrt{b} = \sqrt{a \times b} [/tex]