Step-by-step explanation: Do you see the ''tick marks?'' They both have 1 set of 2, and 1 set of 1. If that makes sense. They also have a "angle" in one of their acute angles.
We can subtract the sum of the two trinomials by one of the trinomials. (7x²-5x+4)-(3x²+2x-1) Let's look at each part. 7x²-3x²=4x² -5x-2x=-7x 4-(-1)=5 So, the trinomial should look like: 4x²-7x+5 So, C. 4x²-7x+5 is the other trinomial.
