Question

b) Factorise :
@ 4x²+20x9​

Answer 1

Answer:

4x(x+45)

Step-by-step explanation:

4x²+20x(9)

4x²+180x

4x(x+45)

Answer 2

Answer:  If the sign with 9 is '+' then,

Given:        4x²+ 20x+ 9​

⇒              4x² + 2x + 18x +9

⇒            2x ( 2x + 1) + 9 ( 2x + 1)

⇒               (2x + 1)(2x + 9)

∴ So there will be two values of x = -1/2 and -9/2

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