Question

Find value of x when y = 1

Answer 1

x = 3.2

Step-by-step explanation:

when y = 1

1 = x²-2x-3

x²-2x-3-1 = 0

x²-2x-4 = 0

• using the formula:

`x = ( -b \pm √(b^2 - 4ac))/(2a)`

`x = ( 2 \pm √((-2)^2 - 4(1)(-4)))/(2*1)`

`x = 1 + √(5)`

x = 3.236

x = 3.24 in 2 decimal places

x = 3.2 in nearest tenth