Advertisements
Advertisements
प्रश्न
Factorise the following.
y2 + 4y – 21
उत्तर
We have,
y2 + 4y – 21 = y2 + (7 – 3)y – 21
= y2 + 7y – 3y – 21
= y(y + 7) – 3(y + 7)
= (y + 7)(y – 3)
APPEARS IN
संबंधित प्रश्न
Expand `("x"-2/"x")^2`
Expand the following square, using suitable identities
(xyz – 1)2
Evaluate the following, using suitable identity
9982
Factorise the following using suitable identity
x2 – 8x + 16
Using suitable identities, evaluate the following.
(9.9)2
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
x2 – 8x + 16
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
a2y2 – 2aby + b2
Factorise the following.
y2 – 2y – 15
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).
Verify the following:
(a – b)(a – b)(a – b) = a3 – 3a2b + 3ab2 – b3
