Question

What are the approximate solutions of 4x^2 + 3 = −12x to the nearest hundredth? Someone please show steps!!!!!!!1

Answer 1

@jim_thompson5910

Answer 2

Have you considered the Quadratic Formula?

Answer 3

Yes I just ended up with whole numbers and my choice are all irrational decimals. I just need to see someone work it out

Answer 4

Did you use b = 12 (correct) or b = -12 (incorrect)?

Answer 5

I used positive 12

Answer 6

Okay, then one piece at a time: 12^{2} - 4*4*3 = 144-48 = 96

\(\sqrt{96} = 4\sqrt{6}\)

How about that? Pretty clear that you shouldn't have Whole Numbers after that.

Answer 7

Where did you get the 4 and 6 and i dont inderstand how you got sqaure rrot of 96. I got the square root of 96/ 8 which is twelve?

Answer 8

I see: \(x = \dfrac{-12\pm\sqrt{96}}{8}\) is correct.

This is the same as \(x = -\dfrac{12}{8}\pm\dfrac{\sqrt{96}}{8}\)

This is NOT the same as \(x = -\dfrac{12}{8}\pm\sqrt{\dfrac{96}{8}}\) <== This is an error.

Answer 9

I dont understand i=how to solve fromt here @tkhunny

Answer 10

x ≈ −2.72 and x ≈ −0.28
I got it! this is rounded of course. Thanks!