Choose the best answer from the four choices given. You may use scratch paper.
Which of the following equations has both 1 and -3 as solutions?
O x2 - 2x -3 =0
x² + 2X-3 =0
O x2 - 4x +3 =0
O x2 + 4x +3 =0

The answer is B.

Step-by-step explanation:

Instead of solving each equation, simply think about it alternatively.

Recall that quadratic equations can also be written as: , where and are the solutions.

We know that 1 and -3 are solutions, so we can substitute them in for and .

Thus, we have:

Now, expand:

The answer is B.

both equations and proportions are better.

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step-by-step explanation: