Question

Factorise completely : 5b^2 + 45b + 90

Answer 1

Answer:

b= -6 or -3

Step-by-step explanation:

5b² + 45b + 90 = 0

on dividing the equation by 5

b² + 9b + 18 = 0

middle term splitting,

b² + 3b + 6b + 18 = 0

b( b + 3 ) + 6( b + 3 ) = 0

( b + 3 )( b + 6 )= 0

⇒b = -3

or b = -6

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