Question

Factorise 18a2 + 84ab + 9862​

Answer 1

Step-by-step explanation:

18a

2

−50=2(9a

2

−25)

=2\left [ (3a)^{2}-(5)^{2} \right ]$$

We know appropriate identities x

2

−y

2

=(x+y)(x−y)

Here x=3a and y=5

∴2[(3a)

2

−(5)

2

]

=2(3a−5)(3a+5)

Answer 2

do sum of 18a² + 84 ab= 96a²b

then sum of 96a²b + 9862 = 9958a²b