Tolong dibantu ya..Makasih

5) 4p - [tex] 5q^{2} [/tex]
= (4p - 5q) (4p - 5q)
= 16[tex] p^{2} [/tex] - 20pq - 20pq + 25[tex] q^{2} [/tex]
= 16[tex] p^{2} [/tex] - 40pq + 25[tex] q^{2} [/tex] (C)

6) Rumus: [tex] ax^{2} - by^{2} = (\sqrt{a}x - \sqrt{b} y)( \sqrt{a} x + \sqrt{b} y)[/tex]
[tex]= 16x^{2} - 81y^{2} = (\sqrt{16} x - \sqrt{81} y)( \sqrt{16} x + \sqrt{81} y[/tex]
[tex]= (4x - 9y) (4x + 9y) [/tex] (A)


7) [tex] x^{2} - 5x - 6[/tex]
= [tex](x^{2} - 6x) + (x - 6)[/tex]
= [tex]x (x - 6) + 1 (x - 6)[/tex]
= [tex](x + 1) (x - 6)[/tex] (C)