Answer:
1) 3( 2) - 1 = 6 - 1 = 5
2) 2(-1) - 3+4(-1) = -2 -7 = -9
3) 4^2-6(4)=9 = 16-24=9, = -8=9
Type in graphing calculator and you will get the answer at this moment is really hard this part

Step-by-step explanation:
Step 1 : Taking L.H.S(Left Hand Side) we have,
... equation (1)
Step 2 : As we know, 
Therefore,
by substituting value in equation (1), we have

Step 3 : As, L.H.S = R.H.S
Hence Proved,
