Find the product of:
a) 5a²(6a+4)
b) (4a+5)(7a-9)
Answers
Answered by
0
Answer:
the ist answer will be 30acube +20asquare
2nd is 28asquare -a-45
Answered by
1
Step-by-step explanation:
a)5a^2(6a+4)
=30a^3+20a^2
=a^2(30a+20a)
= a^2(50a)
=50a^3
b)(4a+5)(7a-9)
=28a^2-36a+35a-45
=4a(7a-9)+5(7a-9)
=(4a+5)(7a-9)
4a+5=0 &. 7a-9=0
a=-5/4. a=9/7
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