Advertisements
Advertisements
Question
Evaluate: (5xy − 7) (7xy + 9)
Sum
Advertisements
Solution
(5xy − 7) (7xy + 9) = 5xy (7xy + 9) − 7 (7xy + 9)
= 35x2y2 + 45xy − 49xy − 63
= 35x2y2 − 4xy − 63
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Use suitable identity to find the following product:
(x + 4) (x + 10)
Evaluate the following product without multiplying directly:
103 × 107
If 9x2 + 25y2 = 181 and xy = −6, find the value of 3x + 5y
Evaluate of the following:
933 − 1073
Find the following product:
\[\left( \frac{3}{x} - \frac{5}{y} \right) \left( \frac{9}{x^2} + \frac{25}{y^2} + \frac{15}{xy} \right)\]
Find the following product:
(3x + 2y + 2z) (9x2 + 4y2 + 4z2 − 6xy − 4yz − 6zx)
If a2 - 5a - 1 = 0 and a ≠ 0 ; find:
- `a - 1/a`
- `a + 1/a`
- `a^2 - 1/a^2`
Use the direct method to evaluate :
(2a+3) (2a−3)
Use the direct method to evaluate :
(xy+4) (xy−4)
Evaluate: `(4/7"a"+3/4"b")(4/7"a"-3/4"b")`
