Question

1
11. If
а
V5, find the values of : (i)
1
a
(a + a
(ii)
a
,3
a
1
a2
12. If
+
2
27, find the values of : (i)
1
-3
a
α
(ii)
a
3
2
1
X
+
3
5' find the values of : (i)
Za
13. If
25 x2
w () -
x +
1
125 x
5x
2
1
14. If
= 3, show that
X + -
78
+
13 )
= 0.
3
a
b.
5
c
a
c
15. If
, prove that (a + b + c)(a − b + c) = (a? + b + c2).
b
[Hint. Let = k. Then, b ck and a = bk.
b.
.. b = ck and a = ck.
Put these values in required identity and show that L.H.S. = R.H.S.]
16. Find the product using suitable identities :
6
36
+6+
(i) (3a + 4b)(9a2 - 12ab + 1662)
17. Simplify using suitable identity :
(3x - 5y - 4)(9x2 + 25y2 + 16 + 15xy – 20y +12x)
2
(ii) y
(1-9
2
у
+​

Answer 1

Answer:

what is this my mind is blocked and error

Answer 2

Answer:

I don't know my mind is blocked