[tex]2 \times 2 = 4[/tex] then multiply the exponents
[tex]x ^{3} \times x ^{ - 1} [/tex] multipling like this will look like addition. [tex] {x}^{3} \times {x}^{ - 1} = {x}^{2} [/tex] so in other words you could do it like this too [tex] {x}^{3} + {x}^{ - 1} = {x}^{2} [/tex] now add the exponent with 4 [tex]4 + {x}^{2} = 4x ^{2} [/tex]
now for the last part [tex] {y}^{3} + {y}^{ - 3} = 0[/tex] because -3 and 3 added together make 0 [tex]0 + 4 {x}^{2} = 4 {x}^{2} [/tex] I hope this help(it looks complicated but it's very easy and I hope I helped you out)
