Advertisements
Advertisements
प्रश्न
Use the direct method to evaluate :
(2+a) (2−a)
बेरीज
Advertisements
उत्तर
Note: (a+b) (a−b) = a2 − b2
(2+a) (2−a) = (2)2 − (a)2
= 4 − a2
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Factorise the following using appropriate identity:
`x^2 - y^2/100`
Evaluate the following using suitable identity:
(102)3
Without actually calculating the cubes, find the value of the following:
(28)3 + (–15)3 + (–13)3
Write in the expanded form: `(x/y + y/z + z/x)^2`
Simplify of the following:
\[\left( x + \frac{2}{x} \right)^3 + \left( x - \frac{2}{x} \right)^3\]
Find the following product:
(x3 + 1) (x6 − x3 + 1)
If x + y = `7/2 "and xy" =5/2`; find: x - y and x2 - y2
Use the direct method to evaluate :
(4+5x) (4−5x)
Evaluate: `(4/7"a"+3/4"b")(4/7"a"-3/4"b")`
If m - n = 0.9 and mn = 0.36, find:
m2 - n2.
