factorise 25 square - 4 ab square + 28 BC - 42c square. help
Share
factorise 25 square - 4 ab square + 28 BC - 42c square. help
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Answer:
25a2−(4b−28bc+42c2) splitting middle term,
=25a2−[4b2−14bc−21bc+42c2]
=25a2−[2b(2b−7c)−7c(2b−6c)]
=25a2−(2b−7c)2=(5a)2−(2b−6c)2
=(5a+2b−7c)(5a−2b+6c
Step-by-step explanation: