Advertisements
Advertisements
Question
If m = 9x2 - 4xy + 5y2 and n = - 3x2 + 2xy - y2 find: 2m - n
Sum
Advertisements
Solution
m = 9x2 - 4xy + 5y2
n = - 3x2 + 2xy - y2
∴ 2m - n
= 2 (9x2 - 4xy + 5y2) - (- 3x2 + 2xy - y2)
= 18x2 - 8xy + 10y2 + 3x2 - 2xy + y2
= 18x2 + 3x2 - 8xy - 2xy + 10y2 + y2
= 21x2 - 10xy + 11y2
shaalaa.com
Performs Operations (Addition and Subtraction) on Algebraic Expressions with Integral Coefficients Only.
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Subtract: 4x2 - 5x2y + y2 from - 3y2 + 5xy2 - 7x2 - 9x2y
The perimeter of a triangle is 14a2 + 20a + 13. Two of its sides are 3a2 + 5a + 1 and a2 + 10a – 6. Find its third side.
Simplify: 4x + 7y - (5y - 8) - 2x
Simplify: - 2m + 5 + 4(m - 3)
Copy and complete the following multi-plication:
3xy - 2x2 - 6x
× -5x2y
Simplify: `"2p"/3 -"3p"/5`
Simplify: `"y"/5 + "y" - "19y"/15`
Simplify: `"x"/5 + "x + 1"/2`
Simplify: `"3y"/5 - "y + 2"/2`
Simplify: `(5 ("x" - 4))/3 + (2(5x - 3))/5 + (6(x - 4))/7`
