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Integers — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSIntegers1 Mark
Question
$(-157) \times (-19) + 157 =$ _____.
✓

Answer

$(-157) \times (-19) + 157 = (-1) \times (157) \times (-19) + 157.$
Solution:
$(-157) \times (-19) + 157 = (-1) \times (157) \times (-19) + 157 = 157\{-(-19) + 1\}$
$ [$taking $157$ as common$] = 157\{19 + 1\} = 157 \times 20 = 3140$

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