457-336t+64t²=25

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457-336t+64t²=25457-336t+64t²=25457-336t+64t²=2564t²-336t+432=04t²-21t+27=0

457-336t+64t²=25
457-336t+64t²=25

457-336t+64t²=25
64t²-336t+432=0
4t²-21t+27=0
(t-3)(4t-9)=0
t=3或t=2.25