When a=0, b=-1 find the value of the given expressions:
(i) 2a + 2b
(ii) 2a2 + b2+1
(iii) 2a2b + 2ab2 + ab
(iv) a2 + ab +2
(i) 2a + 2b
Put a = 0 and b = -1
= 2(0) + 2(-1)
= 0 - 2
= -2
(ii) 2a2 + b2 +1
Put a = 0 and b = -1
= 2(0)2 + (-1)2 + 1
=2(0) + 1 + 1
=0 + 1 + 1
=1
(iii)2a2b + 2ab2 + ab
Put a = 0 and b = -1
= 2(0)2(-1) + 2(0)(-1)2 + 0(-1)
=2(0)(-1) + 2(0)(1) + 0
=0 + 0 + 0
=0
(iv) a2 + ab + 2
Put a = 0 and b = -1
=(0)2 + 0(-1) + 2
= 0 + 0 + 2
=2