Advertisements
Advertisements
प्रश्न
Factorise the following using suitable identity
64x2 – 112xy + 49y2
Advertisements
उत्तर
64x2 – 112xy + 49y2 = 82x2 – (2 × 8x × 7y) + 72y2
This expression is of the form of identity
a2 – 2ab + b2 = (a – b)2
(8x)2 – (2 × 8x × 7y) + (7y)2 = (8x – 7y)2
64x2 – 112xy + 49y2 = (8x – 7y)(8x – 7y)
APPEARS IN
संबंधित प्रश्न
Expand (2)2p − 3q
Factorise the following expressions
y2 – 10y + 25
The factors of x2 – 4x + 4 are __________
Show that (m – n)2 + (m + n)2 = 2(m2 + n2)
Square of 9x – 7xy is ______.
(a – b)2 = a2 – b2
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
4a2 – 4ab + b2
Factorise the following.
y2 + 4y – 21
Factorise the following.
x2 – 10x + 21
The curved surface area of a cylinder is 2π(y2 – 7y + 12) and its radius is (y – 3). Find the height of the cylinder (C.S.A. of cylinder = 2πrh).
