Advertisements
Advertisements
प्रश्न
Multiply: 4a + 5b and 4a - 5b
उत्तर १
Product of 4a + 5b and 4a - 5b
= 16a2 - 25b2
4a + 5b
× 4a - 5b
16a2 + 20ab
- 20ab - 25b2
16a2 - 25b2
उत्तर २
(4a + 5b) × (4a − 5b)
(x + y) (x − y) = x2 − y2
x = 4a and y = 5b
Using the formula:
(4a + 5b) (4a − 5b) = (4a)2 − (5b)2
Simplify each term
(4a)2 = 16a2,
(5b)2 = 25b2
(4a + 5b) (4a − 5b) = 16a2 − 25b2
= 16a2 − 25b2
APPEARS IN
संबंधित प्रश्न
Subtract: 6m3 + 4m2 + 7m - 3 from 3m3 + 4
Subtract the sum of 3a2 – 2a + 5 and a2 – 5a – 7 from the sum of 5a2 -9a + 3 and 2a – a2 – 1
The perimeter of a rectangle is 28x3+ 16x2 + 8x + 4. One of its sides is 8x2 + 4x. Find the other side
Simplify: - 2m + 5 + 4(m - 3)
Simplify: 5(x − 4) − 3(x − 4) + 7(x − 4)
Multiply: 3x, 5x2y and 2y
Copy and complete the following multi-plication:
9x + 5y
× - 3xy
Evaluate: (5m - 2n)(5m + 2n)(25m2 + 4n2)
Simplify: `"6k"/7 - ("8k"/9 - "k"/3)`
Simplify: `("p" + "p"/3)("2p" + "p"/2)("3p" - "2p"/3)`
