Question

Here are two steps from the derivation formula who took place between the first step and the second step

Answer 1

Choice B is the answer.

Explanation:

We have given two step.

(x+b/2a)² = b²-4ac / 4a² Step I

a+b/2a = ±√b²-4ac / 4a² Step II

We have to choose the method to move step I to step II.

Taking square root to both sides of step I, we have

√(x+b/2a)² = √b²-4ac/4a²

As we know that

√x² = ±x

(x+b/2a) = ±√b²-4ac / 4a² and we get the step II.

Hence, the answer is choice B.

Answer 2

B. Taking square root of both sides

Explanation:

The first step given to us is

`(x+(b)/(2a) )^2=(b^2-4ac)/(4a^2)`

When we take square root of both sides we obtain;

`x+(b)/(2a)=\pm \sqrt{(b^2-4ac)/(4a^2) }`

Therefore the corect answer is B