Question

50a²+ 98b²+ 140ab. factorise

Answer 1

50a^2 +98b^2 +140ab
=2(25a^2 +49b^2 +70ab)
=2[(5a)^2 +2.5a.7b+(7b)^2]
=2(5a+7b) ^2
=2(5a+7b)(5a+7b)

Answer 2

50a2+140ab+98a2
2(25a2+70ab+49a2)
2(25a2(35+35)ab+49a2
2(25a2+35ab+35ab+49a2)
2(5a(5a+7b)+7b(5a+7b)
2(5a+7b)(5a+7b)