Answer:
Its C i.e obtuse angle......
Here you go, hope I helped.
Answer:
Step-by-step explanation:
a) 3x^2-12x-11=3*x^2-3*2*2*x+3*4-23=3*(x^2-2*2x+2^2)-23=3*(x-2)^2-23
so a= -2 ,b= -23
b) x1=[12+V(12^2-4*3* -11)]/6=12/6+V(144+132)/6=2+2/6V69=2+1/3V69=
2+V69/9=2+V23/3
c=2, d= 23/3
First 5 terms are: -1,0,3,8,15
Step-by-step explanation:
we will put n=1,2,3,4,5 to find first 5 terms of the sequence
Explicit formula for sequence is:

Putting n=1

Putting n=2

Putting n=3

Putting n=4

Putting n=5

Hence,
First 5 terms are: -1,0,3,8,15
Keywords: Arithmetic sequence, Common difference
Learn more about arithmetic sequence at:
#LearnwithBrainly
24300 :) that's the answer