Question

5.Factorise: 3x² -x -4​

Answer 1

(3x - 4)(x + 1)

Step-by-step explanation:

3x² -x -4

3x² +3x - 4x -4

3x(x + 1) - 4(x + 1)

(3x - 4)(x + 1)

Answer 2

• 3x² - (4-3)x - 4 = 0
• 3x² - 4x + 3x - 4 = 0
• 3x² + 3x - 4x - 4 = 0
• 3x(x+1) - 4(x+1) = 0
• (x+1)(3x-4) = 0
• then ,
• x + 1 = 0 => x = -1
• 3x - 4 = 0 => 3x = 4 => x = 4/3
• then
• ROOTS ARE -1 and 4/3

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