Algebra Ex 3.7-10th Std Maths-Book Back Question And Answer
Question 1.
Find the square root of the following.
(i) 400x4y12z16100x8y4z4
Answer:
(ii) 7x2+214√x+2x2−12x+116
Answer:
(iii) 121(a+b)8(x+y)8(b−c)881(b−c)4(a−b)12(b−c)4
Answer:
Question 2.
Find the square root of the following
(i) 4x2 + 20x + 25
Answer:
(ii) 9x2 – 24xy + 30xz – 40yz + 25z2 + 16y2
Answer:
(iii) 1+1x6+2x3
Answer:
(iv) (4x2 – 9x + 2)(7x2 – 13x – 2)(28x2 – 3x – 1)
Answer
4x2 – 9x +2 = 4x2 – 8x – x + 2
= 4x(x – 2)-1 (x – 2)
= (x – 2)(4x – 1)
7x2 – 13x – 2 = 7x2 – 14x + x – 2
= 7x (x – 2) + 1 (x – 2)
= (x – 2) (7x + 1)
28x2 – 3x – 1 = 28x2 – 7x + 4x – 1
= 7x (4x – 1) + 1 (4x – 1)
= (4x – 1) (7x + 1)
(v) (2x2 + 176x + 1) (32 x2 + 4x + 2) (43 x2 + 113 x + 2)
Answer:
