Which of these is an equation?

2x ＝ y

(9x⁵)(x³x ^-5)

3x² + 8x – 4

all of these

Which of these shows valid notation for dividing each side of 2x² + 8x + 8 ＝ 12 by 2?

`(2x^2 + 8x + 8 ＝ 12) / 2`

`(2x^2 + 8x + 8)/2 ＝ 12/2`

`2x^2 + 8x + 8 ÷ 2 ＝ 12 ÷ 2`

`÷ 2 (2x^2 + 8x + 8) ＝ 12 ÷ 2`

What is the first step in solving 3(4x + 5)² ＝ 36?

Divide each side by 4 to get 3(x + 5)² ＝ 9.

Divide each side by 3 to get (4x + 5)² ＝ 12.

Subtract 5 from each side to get 3(4x) ＝ 32.

Take the square root of each side to get 3(4x + 5) ＝ ±6.

Solve 6x ＝8, and simplify.

`x ＝ 4/3`

`x ＝ 8/6`

`x ＝ 1.33`

`x ＝ 1.3333`