Question

Solve: 21x2 – 8x – 4 = 0 (quadratic equation)​

Answer 1

Answer:

x= $\frac{4+\sqrt{8x^{2} +336} }{21}$ or x=$\frac{4-\sqrt{8x^{2} +336} }{21}$

Step-by-step explanation:

Using the quadratic equation we can see that

$\frac{8+-\sqrt{8x^{2} -4(21)(-4)} }{42}$

$\frac{4+-\sqrt{8x^{2} +336} }{21}$

Answer 2

Answer: -2/7 , 2/3

Step-by-step explanation:

Image is attached.

Hope it helps!!