Solve using the quadratic formula. Approximate answers to the nearest tenth.
x^2-4x-7=0

Question

Solve using the quadratic formula. Approximate answers to the nearest tenth.
x^2-4x-7=0

mathstudent55 · Answer

Do you know the quadratic formula?

anonymous · Answer

Yeah, but im just confused on how to turn it into a decimal.

mathstudent55 · Answer

What do you have that you need to turn into a decimal?

anonymous · Answer

well the thing says approximate to the nearest tenth

mathstudent55 · Answer

Yes, I understand. Once you used the quadratic formula, what solutions did you get?

mathstudent55 · Answer

First use the quadratic formula. You'll get two solutions with square roots in them. Then use a calculator to find decimal approxinmations of the solutions.

anonymous · Answer

Okay I did that, but how do I write it?

anonymous · Answer

cuz the decimal is 3.32

anonymous · Answer

$$\left\{x=2-\sqrt{11},x=2+\sqrt{11}\right\} $$$$\{x=-1.3,x=5.3\} $$

mathstudent55 · Answer

What did you get as solutions of the quadratic formula?

mathstudent55 · Answer

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