Erfana Beevee Binte Hassan Shariff's answer to Preethisha's Secondary 1 Maths Singapore question.
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Remember these rules:
(-)(-) = (+)
(-)(+)=(-)
(+)(-)=(-)
29a + (-13) - 7a - (-18b) + (-20) - 15b
= 29a - 13 - 7a + 18b - 20 - 15b
= 29a -7a + 18b - 15b - 13 -20
= 22a + 3b - 33
(-)(-) = (+)
(-)(+)=(-)
(+)(-)=(-)
29a + (-13) - 7a - (-18b) + (-20) - 15b
= 29a - 13 - 7a + 18b - 20 - 15b
= 29a -7a + 18b - 15b - 13 -20
= 22a + 3b - 33
Date Posted:
8 months ago
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