3.1 Solve : 4x2+3 = 0. Subtract 3 from both sides of the equation : 4x2 = -3. Divide both sides of the equation by 4: x2 = -3/4 = -0.750. When two things are equal, their square roots are equal. Taking the square root of the two sides of the equation we get: x = ± √ -3/4. In Math, i is called the imaginary unit. It satisfies i 2 =-1.
