Question

Solve 0 = 4x2+12x+9.

Select the equation that shows the correct substitution of a, b, and c in the quadratic formula.

Answer 1

It's C and the next one is -1.5

=)

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Answer 2

`-(3)/(2)`

Explanation:

The equation is written in the form:

`ax^2 +bx+c=0`

where a=4, b=12 and c=9.

The solutions of the equation above are found with the formula:

`x_(1,2) = (-b\pm √(b^2-4ac))/(2a)`

Substituting a,b,c with the respective numbers, we find

`x_(1,2) = (-12\pm √((12)^2-4(4)(9)))/(2(4))=(-12\pm 0)/(8)=-(3)/(2)`