Advertisements
Advertisements
प्रश्न
Evaluate: (5xy − 7) (7xy + 9)
Advertisements
उत्तर
(5xy − 7) (7xy + 9) = 5xy (7xy + 9) − 7 (7xy + 9)
= 35x2y2 + 45xy − 49xy − 63
= 35x2y2 − 4xy − 63
APPEARS IN
संबंधित प्रश्न
Simplify the following products:
`(2x^4 - 4x^2 + 1)(2x^4 - 4x^2 - 1)`
If \[x^2 + \frac{1}{x^2} = 98\] ,find the value of \[x^3 + \frac{1}{x^3}\]
Find the following product:
If x = 3 and y = − 1, find the values of the following using in identify:
\[\left( \frac{x}{7} + \frac{y}{3} \right) \left( \frac{x^2}{49} + \frac{y^2}{9} - \frac{xy}{21} \right)\]
Use the direct method to evaluate the following products :
(3x – 2y) (2x + y)
Use the direct method to evaluate :
(ab+x2) (ab−x2)
Evaluate the following without multiplying:
(95)2
Evaluate the following without multiplying:
(103)2
If `x + (1)/x = 3`; find `x^2 + (1)/x^2`
If x + y = 1 and xy = -12; find:
x2 - y2.
