[tex](a-b)^{2} = a^{2} - 2ab + b^{2}[/tex]
[tex](2-9t)^{2} = 2^{2} - 2*2*9t + (9t)^{2} = 4 - 36t + 81t^{2} = 81t^{2} - 36t + 4[/tex]
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[tex](a-b)^{2} = a^{2} - 2ab + b^{2}[/tex]
[tex](2-9t)^{2} = 2^{2} - 2*2*9t + (9t)^{2} = 4 - 36t + 81t^{2} = 81t^{2} - 36t + 4[/tex]