Simplify the following expressions and evaluate them as directed :- ( 3ab - 2a2 + 5b2 ) × ( 2b2 - 5ab + 3a2 ) + 8a3b - 7b4 for a = 1 , b = -1
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3ab−2a2+5b2)×(2b2−5ab+3a2)+8a3b−7b4
=3ab(2b2−5ab+3a2)−2a2(2b2−5ab+3a2)+5b2(2b2−5ab+3a2)+8a3b−7b4
=6ab32−15a2b2+9a3b−4a2b2+10a3b−6a4+10b4−25ab3+15a2b2+8a3b−7b4
=27a3b−4a2b2−19ab3−6a4+3b
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(3ab−2a2+5b2)×(2b2−5ab+3a2)+8a3b−7b4
=3ab(2b2−5ab+3a2)−2a2(2b2−5ab+3a2)+5b2(2b2−5ab+3a2)+8a3b−7b4
=6ab32−15a2b2+9a3b−4a2b2+10a3b−6a4+10b4−25ab3+15a2b2+8a3b−7b4
=27a3b−4a2b2−19ab3−6a
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