Question

умоляю помогите очень срочно ​

Answer 1

$\displaystyle\bf\\\sqrt{(t-7)(t+2)} \\\\(t-7)(t+2)\geq 0$

+ + + + + [- 2] - - - - - [7] + + + + +

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$\displaystyle\bf\\t\leq -2 \ ; \ t\geq7$

Answer 2

Ответ:   №3 .

$\sqrt{(t-7)(t+2)}\\\\ODZ:\ \ (t-7)(t+2)\geq 0\ \ ,\ \ \ t_1=7\ ,\ t_2=-2\\\\znaki:\ \ +++[-2\, ]---[\ 7\ ]+++\\\\\\\boxed{\ t\in (-\infty ;-2\ ]\cup [\ 7\ ;+\infty \, )\ }\\\\\\ili:\ \ \ t\leq -2\ ,\ t\geq 7$