7. She is not correct. The simplification of this expression is 22a-32.
8. She is correct. The simplification of this expression is 4a-10.
The last one is tricky because I honestly do not know how to do it but you can google It.
I hope that it helped some though
Hello :
<span>the quadratic equation : ax²+bx+c = 0
when : a = -1 b = 3 c = c
delta : </span>Δ = b²-4ac = 3² -4(-1)(c)
Δ = 9 + 4c
to have no real number solutions when : Δ <span>< 0
so : </span> 9 + 4c < 0
c < -9/4 ....(<span>values of c)</span>
Answer:and?
Step-by-step explanation: