Question

ow do i factor 2x^2-21+40
( 4x-?)(x+?)

Answer 1

Which methods of factoring binomials have worked for you before?
1) factoring by grouping
2) quadratic formula
3) synthetic division
4) long division

Please double-check the polynomial you've posted here. Seems to me that something's missing.

Answer 2

quadratic formula 2x^2 -21+ 40

Answer 3

something is still missiong from your polynomial. Check again to ensure that you've copied everything down.

Once you have this polynomial (actually, a trinomial), identify a, b and c.

Then substitute your values for a, b and c into the quadratic equation, to solve for x.

Answer 4

ok I will check