Advertisements
Advertisements
प्रश्न
Simplify (2x +5)2 − (2x − 5)2
Advertisements
उत्तर
(2x +5)2 − (2x − 5)2 = (2x)2 + 2(2x) (5) + (5)2 − [(2x)2 − 2(2x) (5) + (5)2]
[(a − b)2 = a2 − 2ab + b2]
[(a + b)2 = a2 + 2ab + b2]
= 4x2 + 20x + 25 − [4x2 − 20x + 25]
= 4x2 + 20x + 25 − 4x2 + 20x − 25 = 40x
संबंधित प्रश्न
Use a suitable identity to get the following products.
(− a + c) (− a + c)
Using identities, evaluate 78 × 82
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 5.1 × 5.2
Use the formula to multiply the following.
(3x − 5) (3x + 5)
Use the formula to multiply the following.
`(x/5+6)(x/5-6)`
Use a formula to multiply of (2t – 5)(2t + 5)
(a + b)2 = a2 + b2
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 2x + 1
The area of a circle is given by the expression πx2 + 6πx + 9π. Find the radius of the circle.
Factorise p4 + q4 + p2q2.
