Question

The steps to derive the quadratic formula are shown below:

Answer 1

Step 1: ax2 + bx + c = 0
Step 2: x2 + b over ax + c over a = 0
Step 3: x2 + b over ax = - c over a
Step 4: x2 +b over a x + square of quantity of b over 2 times a = - c over a + square of quantity of b over 2 times a
Step 5: x plus b over 2 times a, all squared = - c over a+ square of quantity of b over 2 times a
Step 6: x + b over 2 times a = square root of all of c over a plus b over 2 times a squared
Step 7: x = - b over 2 times a± square root of all of negative c over a plus the square of the quantity b over 2 times a = -b over 2 times a ± square root of the quantity of b squared minus 4 times a times c over 4 times a squared= negative b plus or minus square root of b squared minus 4 times a times c over 2 times a

Which of the following statements best describes the first incorrect step?@welshfella @amistre64

Answer 2

@welshfella

Answer 3

@triciaal