Q.1Is (√3 + √7)2
a rational number or not?
Q.2 Find : 172
. 175
Q.3Write the degree of the polynomial 3.
Q.4 Find the value of the polynomial 5x – 4x2
+ 3 at x = -1.
Q.5Complete the following identities:
(i)( x + y + z)2
(ii)x3
+ y3
+ z3
– 3xyz
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Answer:
Q. 1.
No because roots are not rational
Q. 2.
30100
Q. 3.
1
Q. 4.
x=−1
(5)(−1) − 4(−1)^2 + 3
(5)(−1) − 4(−1)^2 + 3
(-5) - 4 + 3
-9 + 3
=−6
Q. 5.
(i) x^2+y^2+z^2+2xy+2xz+2yz
(ii) (x^2+y^2+z^2+2xy+2xz+2yz ) (x+y+z)
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