Answer
$(t-4)(t-6)$
Work Step by Step
$t^2-10t+24=(t-4)(t-\underset\uparrow?)$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ $added to 4, must equal 10
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ $multiplied by 4, must equal 24
Let y be ?.
$y+4=10$
$y+4-4=10-4$
$y=6$
$4y=24$
$4y\div4=24\div4$
$y=6$