Question

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

Answer 1

Explanation:

7x² + 2x - 1 = 0

x = (-2 ±
`√(2^2 - 4(7)(-1))` )/ (2(7))

x = (-2 ±
`√(32)` ) /14

x = (-2 ± 4
`√(2)` ) /14

x =
`(-1)/(7)` ±
`(2)/(7)`
`√(2)`

Answer 2

2/7 or -30/7

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