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1․ 4a(3a−5)=4ax3a=12a²-4ax5=12a²-20a

2․ −2x(7x+9)=-2x.7x-2x.9=14x²-18x

3․ 5m2(2m2−3m+4)=5m².2m².3m+4=10m^4-15m²+4

4․ −6p(4p3−p2+2p−1)=6p.4p²p

5. 3×3(5x−7×2+6)

6. −8k2(3k2+2k−4)

7. 7y(4y2−y+5)

8. −3t3(t2−6t+9)

9. 2n(9n3−3n+1)

10. 5q2(2q−4q2+7)

11․ (2x+3)(x+5)

12․ (a−4)(3a+2)

13․ (m+7)(m2−3m+1)

14․ (2p−3q)(4p+q)

15․ (x2+2x−1)(x−3)

16․ (-3a)(-5b)

17․ (−4x)(7xy)

18․ (6m2)(−2m3)

19․ (−8k2)(−3k)

20․ (5p3q)(−4pq2)

21․ (−2x2y)(−3x3y4)

22․ (7a2b3)(−a3b)

23․ (−9m4n)(−m2n3)

24․ (12x)(−x2y3)

25․ (−5p2q4)(4p3q)

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