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Factorise Xy2 - Xz2, Hence, Find the Value of : 40 X 5.52 - 40 X 4.52 - Mathematics

Sum

Factorise xy2 - xz2, Hence, find the value of : 

40 x 5.52 - 40 x 4.52  

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Solution

xy2 - xz2 = x(y2 - z2) = x(y - z)(y + z)

40 x 5.52 - 40 x 4.52  

= 40 (5.5)2 - (4.5)2 

= 40 (5.5 - 4.5) (5.5 + 4.5)

= 40 (1) (10) = 400

Concept: Factorisation by Taking Out Common Factors
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 13 Factorisation
Exercise 13 (F) | Q 7.2 | Page 163
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