Question

please answer my question answer all parts of question ​

Answer 1

use identity it will help you

Answer 2

$\huge \red{✐answer✎}$

$\small \green{↣( - 400) + 781 + ( - 1400) + ( - 81) + 300}$

$\small \green{➜ = - 400 + 781 - 1400 - 81 + 300}$

$\small \green{➷1081 - 1881}$

$\small \green {✓ - 800}$

$\small \green{❛hence \: the \: value \: is \: - 800}$

$\huge \red{☛answer☚}$

$\small \green{⇰ - 273 - 541 + 900 - 511}$

$\small \green{⇒ - 814 + 900 - 511}$

$\small \green{⇔ - 1325 + 900}$

$\small \green{ = 425}$