Advertisements
Advertisements
प्रश्न
Use the direct method to evaluate :
(x+1) (x−1)
Advertisements
उत्तर
Note: (a+b) (a−b) = a2 − b2
(x+1) (x−1) = (x)2 − (1)2
= x2 − 1
APPEARS IN
संबंधित प्रश्न
Evaluate the following using identities:
`(a^2b - b^2a)^2`
Write in the expanded form:
`(a/(bc) + b/(ca) + c/(ab))^2`
Simplify the following expressions:
`(x + y - 2z)^2 - x^2 - y^2 - 3z^2 +4xy`
If x = 3 and y = − 1, find the values of the following using in identify:
\[\left( \frac{x}{y} - \frac{y}{3} \right) \frac{x^2}{16} + \frac{xy}{12} + \frac{y^2}{9}\]
If \[a^2 + \frac{1}{a^2} = 102\] , find the value of \[a - \frac{1}{a}\].
Evalute : `( 7/8x + 4/5y)^2`
If a + `1/a`= 6 and a ≠ 0 find :
(i) `a - 1/a (ii) a^2 - 1/a^2`
Use the direct method to evaluate the following products:
(x + 8)(x + 3)
If `x + (1)/x = "p", x - (1)/x = "q"`; find the relation between p and q.
Factorise the following:
25x2 + 16y2 + 4z2 – 40xy + 16yz – 20xz
