Advertisements
Advertisements
Question
Use the direct method to evaluate :
(3x2+5y2) (3x2−5y2)
Sum
Advertisements
Solution
Note: (a+b) (a−b) = a2 − b2
(3x2+5y2) (3x2−5y2) = (3x2)2 − (5y2)2
= 9x4 − 25y4
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Simplify the expression:
`(x + y + z)^2 + (x + y/2 + 2/3)^2 - (x/2 + y/3 + z/4)^2`
Evaluate:
(0.2)3 − (0.3)3 + (0.1)3
Use the direct method to evaluate :
(ab+x2) (ab−x2)
Use the direct method to evaluate :
`(3/5"a"+1/2)(3/5"a"-1/2)`
Find the squares of the following:
`(7x)/(9y) - (9y)/(7x)`
If a - b = 10 and ab = 11; find a + b.
If p + q = 8 and p - q = 4, find:
p2 + q2
If `"a" + (1)/"a" = 2`, then show that `"a"^2 + (1)/"a"^2 = "a"^3 + (1)/"a"^3 = "a"^4 + (1)/"a"^4`
Simplify:
(3a - 7b + 3)(3a - 7b + 5)
Find the following product:
`(x/2 + 2y)(x^2/4 - xy + 4y^2)`
