Advertisements
Advertisements
Question
Find the value of a, if 9a = 762 – 672
Advertisements
Solution
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
RELATED QUESTIONS
The product of (x + 5) and (x – 5) is ____________
Using the identity (a + b)(a – b) = a2 – b2, find the following product
(4 – mn)(mn + 4)
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)
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/9 - y^2/25`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/25 - 625`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x4 – 1
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
p5 – 16p
The sum of (x + 5) observations is x4 – 625. Find the mean of the observations.
Verify the following:
(ab + bc)(ab – bc) + (bc + ca)(bc – ca) + (ca + ab)(ca – ab) = 0
Verify the following:
(m + n)(m2 – mn + n2) = m3 + n3
