Question

5) The solution to 7X2 + 2X – 1 = 0 can be written as:

Answer 1

Answer:

2/7 or -30/7

Step-by-step explanation:

Use the quadratic formula

a = 7, b = 2, c = -1

-2 + or - (sqrt (2^2 - 4 * 7 * -1) / 2 * 7

-2 + or - 32/14

-2 + or -  16/7

2/7, or -30/7

Answer 2

Answer:

Step-by-step explanation:

7x² + 2x - 1 = 0

x = (-2 ±$\sqrt{2^2 - 4(7)(-1)}$ )/ (2(7))

x = (-2 ± $\sqrt{32}$ ) /14

x = (-2 ± 4$\sqrt{2}$ ) /14

x = $\frac{-1}{7}$ ± $\frac{2}{7}$$\sqrt{2}$