Question

X^2+3x-28 which is a biomial of this trinomial

Answer 1

Our polynomial is $x^{2} +3x-28$
We can tell from -28 that the binomials are one positive and one negative.
We can use a factoring chart. What adds to make +3x and multiplies to make -28. $blank + blank=+3x blank*blank=-28$
To get a negative 28, we can multiply -4 and positive seven, which add together after being multiplied by x to get +3x. Therefore, you are left with (x+7) and (x-4).
$(x+7)(x-4)$

Answer 2

Hey mate!
You stuck?

The answer is: (x + 7)*(x - 4)
.
Check by multiplying:
.
x*x = x^2
x*(-4) = -4x
7*x = +7x
7*(-4) = -28


And since this is the polynomial that you were asked to factor, the two factors we found
are correct ... (x + 7)*(x - 4)
.

Hope this helps!