Select all the expressions that cannot be factored using integral coefficients and integral constants.

a. 25x^2 - 40x + 16
b. 2x^2 + x + 4
c. 6x^2 - 2x - 20
d. x^2 - 2x - 4

Question

Select all the expressions that cannot be factored using integral coefficients and integral constants.

a. 25x^2 - 40x + 16
b. 2x^2 + x + 4
c. 6x^2 - 2x - 20
d. x^2 - 2x - 4

candy13106 · Answer

u use guess and check when u factor

tkhunny · Answer

Do you have he "Discriminant"?

will.h · Answer

You can do that by finding the GCF

will.h · Answer

The 1st one doesn't have GCF (greatest common factor) neither for variables nor constants

tkhunny · Answer

Everything has a GCF.

will.h · Answer

Integral?

triciaal · Answer

are they asking which product (AC) will not have factors that add up to B ?

will.h · Answer

Factoring by groups you mean?

tkhunny · Answer

Perfect Squares from the Discriminant

a. 25x^2 - 40x + 16 ==> 40^2 - 4(25)(16) = 0 ==> You can factor this one.
b. 2x^2 + x + 4 ==> 1^1 - 4(2)(4) = -15  ==> Can't factor this one.
c. 6x^2 - 2x - 20 ==> 2^2 - 4(6)(-20) = 484 ==> You can factor this one.