Question

12. 7x2 + 49x + 84 factorise it!!​

Answer 1

Answer:

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Step-by-step explanation:

$7 {x}^{2} + 49x + 84 \\ 7 {x}^{2} + 21x + 28x + 84 \\ 7x( x + 3) + 28(x + 3) \\ (7x + 28)(x + 3)$

Answer 2

Question:-

7x² + 49x + 84 factorise it.

Answer:-

7x² + 49x + 84

= 7x² + 21x + 28x + 84

= 7x (x+3) + 28(x+3)

= (x+3)(7x+28)

Steps to be remembered:

▪︎First split the mid term such that it is divisible by both 1st and last term