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CISCEICSE ICSE Class 7
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Syllabus

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

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Question

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

Sum
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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 

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Performs Operations (Addition and Subtraction) on Algebraic Expressions with Integral Coefficients Only.
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Q 5.5
Chapter 13: Fundamental Concepts (Including Fundamental Operations) - Exercise 11 (C)

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R.K. Bansal Concise Mathematics [English] Class 7 ICSE
Chapter 13 Fundamental Concepts (Including Fundamental Operations)
Exercise 11 (C) | Q 5.5

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