Question

What is the roots of x in 8x2 +4=12​

Answer 1

`\large\boxed{x=-1\ \vee\ x=1}`

Explanation:

`8x^2+4=12\qquad\text{subtract 4 from both sides}\\\\8x^2+4-4=12-4\\\\8x^2=8\qquad\text{divide both sides by 8}\\\\(8x^2)/(8)=(8)/(8)\\\\x^2=1\to x=\pm\sqrt1\\\\x=-1\ \vee\ x=1`