Subtract: (i) 6xy from –12xy (ii) (a – b) from (a + b) (iii) a(b – 5) from b(5 – a) (iv) –m2 + 5mn from 4m2 – 3mn + 8 (v) – x2 + 10x – 5 from 5x – 10 (vi) 5a2 – 7ab + 5b2 from 3ab – 2a2 – 2b2
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(i) -12xy - ( 6xy) = -12xy - 6xy = -18xy
(ii) (a+b) - (a - b) = a + b - a + b
= a -a + b + b
= 2b
(iii) b(5 - a) - a( b - 5) = 5b -ab -ab + 5a
= 5b + 5a -2ab
(iv)