Question

If 2x - 1 = 6, what is the value of 4x^2 - 1​

Answer 1

48

Explanation:

2x-1=6

2x=6+1

2x=7

x=7/2

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4x^2-1

4(7/2)^2-1

4(49/4)-1

49-1

48

Answer 2

Answer: 48

Explanation:

2x - 1 = 6

Add 1 to both sides of the equation , we have:

2x = 7

divide through by 2

x = 7/2

The value of
`4x^(2)` - 1 will be calculated by substituting in the value of x , that is

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

= 4(
`(49)/(4)`) - 1

= 49 - 1

= 48