Advertisements
Advertisements
प्रश्न
Find the value of a, if 9a = 762 – 672
Advertisements
उत्तर
We have,
9a = 762 – 672
⇒ 9a = (76 + 67)(76 – 67) ...[Using the identity, a2 – b2 = (a + b)(a – b)]
⇒ 9a = 143 × 9
⇒ `a = (143 xx 9)/9`
⇒ a = 143
APPEARS IN
संबंधित प्रश्न
Evaluate the following, using suitable identity
297 × 303
Factorise: 4x2 – 9y2
The pathway of a square paddy field has 5 m width and length of its side is 40 m. Find the total area of its pathway. (Note: Use suitable identity)
The value of (a + 1)(a – 1)(a2 + 1) is a4 – 1.
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
4x2 – 25y2
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
3a2b3 – 27a4b
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
25ax2 – 25a
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x4 – y4
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
y4 – 81
Factorise the expression and divide them as directed:
(9x2 – 4) ÷ (3x + 2)
