What is the value of the coefficient "b" when the quadratic equation y = (2x + 1)(4x − 3) is written in standard form?

Question

anonymous · Answer

Open the brackets and check the coefficients..

phi · Answer

do you use FOIL to multiply out?  if so,  the O and I terms added together give you the b coefficient:

ax^2 + bx + c

anonymous · Answer

not sure how to do it at all! :(

anonymous · Answer

@phi please help!

phi · Answer

This 5 min video is pretty clear http://www.khanacademy.org/math/algebra/polynomials/v/multiplying-binomials It might be easier to watch it than try to follow an explanation written out here...

anonymous · Answer

multiply it using foil
and you get 8x^2-6x+4x -3
simplify
8x^2-2x-3

you b coefficient is -2
since the standard form is ax^2 + bx + c

anonymous · Answer

@jayz657 thank you so much!!