[tex]64 x^{3} -125[/tex]
= [tex](4x)^{3} - 5^{3} [/tex] ------> because, [tex](4x)^{3}[/tex] is same as 64x³ and
[tex]5^{3} [/tex] is same as 125
Using the formula: [tex] a^{3}- b^{3} =(a-b)(a ^{2} +ab+b ^{2} )[/tex], we get,
= [tex](4x -5)((4x)^{2} +4x*5+ 5^{2} )[/tex]
= [tex](4x -5)(16 x^{2} +20x+25)[/tex] ------>that's your answer!!
