Advertisements
Advertisements
प्रश्न
The value of (a + b)2 – (a – b)2 is ______.
पर्याय
4ab
– 4ab
2a2 + 2b2
2a2 – 2b2
Advertisements
उत्तर
The value of (a + b)2 – (a – b)2 is 4ab.
Explanation:
We have,
(a + b)2 – (a – b)2 = a2 + b2 + 2ab – (a2 + b2 – 2ab) ...[∵ (a + b)2 = a2 + b2 + 2ab and (a – b)2 = a2 + b2 – 2ab]
= a2 + b2 + 2ab – a2 – b2 + 2ab
= a2 – a2 + b2 – b2 + 2ab + 2ab
= 2ab + 2ab ...[Combining the like terms]
= 4ab
APPEARS IN
संबंधित प्रश्न
Constant is only 8 other is variable ax + 9
Write the degree of the following polynomial: – 8mn6+ 5m3n
Write numerical co-efficient of the following: – 9a2b3
Subtract the second expression from the first:
4pq - 6p2 - 2q2 , 9p2
Enclose the given term in bracket as required:
x2 -y2 + z2 + 3x – 2y = x2 – (……..)
The coefficient of leading term of the expression 3z2y + 2x – 3 is _________
The value of (a + b)2 + (a – b)2 is ______.
38x3y2z ÷ 19xy2 is equal to ______.
h is a factor of 2π (h + r).
Identify term which contain y2 and give the coefficient of y2.
5y2 + 7x
