English
CISCEICSE ICSE Class 7
Textbook Solutions7017
Concept Notes & Videos214
Syllabus

Evaluate: (5m - 2n)(5m + 2n)(25m2 + 4n2)

Advertisements
Advertisements

Question

Evaluate: (5m - 2n)(5m + 2n)(25m2 + 4n2) 

Sum
Advertisements

Solution

(5m - 2n)(5m + 2n)(25m2 + 4n2) 

= {5m (5m + 2n) - 2n(5m + 2n)} (25m2 + 4n2)

= (25m2 + 10mn - 10mn - 4n2)(25m2 + 4n2) 

= (25m2 - 4n2)(25m2 + 4n2) 

= 25m2 (25m2 + 4n2) - 4n2 (25m2 + 4n2) 

= 625m4 + 100m2n2 - 100m2n2 - 16n4

= 625m4 - 16n4 

shaalaa.com
Performs Operations (Addition and Subtraction) on Algebraic Expressions with Integral Coefficients Only.
  Is there an error in this question or solution?
Q 5.5
Chapter 11: Fundamental Concepts (Including Fundamental Operations) - Exercise 11 (C)

APPEARS IN

Selina Concise Mathematics [English] Class 7 ICSE
Chapter 11 Fundamental Concepts (Including Fundamental Operations)
Exercise 11 (C) | Q 5.5

RELATED QUESTIONS

Subtract: 6m3 + 4m2 + 7m - 3 from 3m3 + 4 


If m = 9x2 - 4xy + 5y2 and n = - 3x2 + 2xy - y2 find: 2m - n


Copy and complete the following multi-plication:

3a + 2b
× - 3xy  


Copy and complete the following multi-plication:

6 - 3x + 2x2 
× 1 + 5x - x2  


Evaluate: (a + 1)(a2 - a + 1) and (a - 1)(a2 + a + 1) 


Multiply: mn4, m3n and 5m2n3 


Multiply: x3 - 3y3 and 4x2y2 


Simplify: `"3a"/8 + "4a"/5 - ("a"/2 + "2a"/5)`


Simplify: `"m"/5 - "m - 2"/3 + "m"`


Simplify: `(2"p" + "p"/7) div ("9p"/10 + "4p")`


Share
Notifications

Englishहिंदीमराठी
Login
Create free account


      Forgot password?
Course
Use app×