Question

Solve:
21x² - 8x - 4 = 0​

Answer 1

Answer:

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Step-by-step explanation:

21$x^{2}$ + 6x - 14x - 4 = 0

3x(7x + 2) - 2(7x + 2) = 0

(7x + 2)(3x - 2) = 0

x = -2/7 and 2/3

Answer 2

Heya!!

Here's your answer!!

21x² - 8x - 4 = 0

Difference = -8

Product = 21 × 4

= 7 × 2 × 3 × 2

= 14 × 6

-14x + 6x

therefore, 21x² - 14x - 6x - 4 = 0

7x(3x - 2) + 2(3x - 2) = 0

(3x - 2) (7x + 2) = 0

therefore,

3x - 2 = 0. or 7x + 2 = 0

3x = 2 7x = -2

x = 2/3. x = -2/7

(-2/7, 2/3) Ans.

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