Question 82 (i)
Subtract
5a2b2c2 from −7a2b2c2
We have, 5a2b2c2 and −7a2b2c2 The required difference is given by −7a2b2c2−5a2b2c2 =(−7−5)a2b2c2=−12a2b2c2
Question 82 (iii)
2ab2c2+4a2b2c−5a2bc2 from−10a2b2c+4ab2c2+2a2bc2
Question 82 (ii)
6x2−4xy+5y2 from 8y2+6xy−3x2
−3p2+3pq+3px from 3p(−p−a−r)
Question 82 (vii)
−3p2+3pq+3px from 3p(-p-a-r)