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

48

Step-by-step explanation:

2x-1=6

2x=6+1

2x=7

x=7/2

4x^2-1

4(7/2)^2-1

4(49/4)-1

49-1

48

48

Step-by-step 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 - 1 will be calculated by substituting in the value of x , that is

- 1 = 4( - 1

= 4() - 1

= 49 - 1

= 48

y < -3

step-by-step explanation:

-3y - 2 > 7

-3y -2 + 2 > 7+2

-3y > 9

-3y/-3 < 9/-3   (change the inequality sign when multiplying or dividing by a negative number)

y < -3