Advertisements
Advertisements
प्रश्न
Use the direct method to evaluate :
(3x2+5y2) (3x2−5y2)
Advertisements
उत्तर
Note: (a+b) (a−b) = a2 − b2
(3x2+5y2) (3x2−5y2) = (3x2)2 − (5y2)2
= 9x4 − 25y4
APPEARS IN
संबंधित प्रश्न
Evaluate the following product without multiplying directly:
104 × 96
Evaluate the following using suitable identity:
(998)3
Evaluate the following using identities:
`(a^2b - b^2a)^2`
Evaluate the following using identities:
(1.5x2 − 0.3y2) (1.5x2 + 0.3y2)
if `x^2 + 1/x^2 = 79` Find the value of `x + 1/x`
If 9x2 + 25y2 = 181 and xy = −6, find the value of 3x + 5y
If a + b + c = 9 and ab + bc + ca = 23, find the value of a2 + b2 + c2.
Find the cube of the following binomials expression :
\[\frac{1}{x} + \frac{y}{3}\]
If \[x^2 + \frac{1}{x^2} = 98\] ,find the value of \[x^3 + \frac{1}{x^3}\]
If a2 + b2 + c2 = 41 and a + b + c = 9; find ab + bc + ca.
