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4x^2+2x-1=0 in quaratic equations

User Tocker
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1 Answer

1 vote

Answer:

Explanation:

"quaratic" should be "quadratic."

The coefficients of this quadratic are 4, 2 and -1. Thus, the discriminant is

b^2 - 4ac, or here, 4 - 4(4)(-1) = 20

Since the discriminant is positive, our quadratic has two real, different roots.

-2 ± (√4)(√5)

The roots are: x = ---------------------

2(4)

-1 ± √5

This reduces to x = ---------------

8

User Borealis
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7.0k points