Question

Factorise: 4 x² + 2x - 1​

Answer 1

Answer :

= 4x² + 2x - 1

= (2x)² + 2 × 2x × 1 - (1)²

• Use identity (a + b)² = a² + 2ab + b²

= (2x + 1)²

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Answer 2

Answer:

(2x + 1)²

Step-by-step explanation:

(4x²+2x-1) = 0

(2x)² + 2×(2x)×(1) - (1)² = 0

[•.• (a+b)² = a² + b² +2ab]

(2x + 1)² = 0