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t^2-6t+9-t^2-4t+4=5
2t^2-10t+13-5=0
2t^2-10t+8=0 dividimos entre 2
t^2-5t+4=0
(t-4)(t-1)=0
t-4=0 y t-1=0
t=4 y t=1
solucion t=4 y t=1
saludos
su desarrollo es: (a + b)² = a² + 2ab +b²
⇒ (t - 3)² = t² -6t + 3²
⇒ (t - 2)² = t² - 4t + 2²
ahora restemos (t - 3)² - (t - 2)² = t² - t² -6t + 4t + 9 - 4
= -2t +5
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