Advertisements
Advertisements
Question
If x = 2 and y = 3, then find the value of the following expressions
2x – 3y
Solution
Given: x = 2, y = 3
2x – 3y = 2(2) – 3(3) = 4 – 9
= 4 + (Additive inverse of 9)
= 4 + (– 9)
= – 5
APPEARS IN
RELATED QUESTIONS
Factorize `x^2 + 5sqrt5x + 30`
Factorize `2x^2 - 5/6x + 1/12`
`(x/2 + y + z/3)^3 + (x/2 + (2y)/3 + z)^3 + (-(5x)/6 - y/3 - (4z)/3)^3`
`2sqrt2a^3 + 16sqrt2b^3 + c^3 - 12abc`
Multiply: x2 + 4y2 + 2xy − 3x + 6y + 9 by x − 2y + 3
If a + b + c = 0, then write the value of a3 + b3 + c3.
If a2 + b2 + c2 = 250 and ab + bc + ca = 3, find a + b + c.
Factorize : x2 − 1 − 2a − a2
The value of \[\frac{(2 . 3 )^3 - 0 . 027}{(2 . 3 )^2 + 0 . 69 + 0 . 09}\]
The expression x4 + 4 can be factorized as
If (x + y)3 − (x − y)3 − 6y(x2 − y2) = ky2, then k =
Evaluate: `(1/2 "a" + 1/2 "b") (1/2 "a" - 1/2 "b")`
Multiply: (2x - 3y)(2x + 3y)
Multiply: (-2x + 3y)(2x - 3y)
Divide: 4a2 - a by - a
Divide: 4a2 + 4a + 1 by 2a + 1
Divide: 3y3 - 9ay2 - 6ab2y by -3y
Express the following as an algebraic expression:
The subtraction of 5m from 3n and then adding 9p to it.
In a polynomial, the exponents of the variables are always ______.
Match Column I with Column II in the following:
| Column I | Column II |
| 1. The difference of 3 and a number squared | (a) 4 – 2x |
| 2. 5 less than twice a number squared | (b) n2 – 3 |
| 3. Five minus twice the square of a number | (c) 2n2 – 5 |
| 4. Four minus a number multiplied by 2 | (d) 5 – 2n2 |
| 5. Seven times the sum of a number and 1 | (e) 3 – n2 |
| 6. A number squared plus 6 | (f) 2(n + 6) |
| 7. 2 times the sum of a number and 6 | (g) 7(n + 1) |
| 8. Three less than the square of a number | (h) n2 + 6 |
