Question

25m² =9 Solve this quadratic equation by factorisation.

Answer 1

Hi ,

Given quadratic equation is 25m² = 9

25m² - 9 = 0

( 5m )² - 3² = 0

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We know the algebraic identity,

a² - b² = ( a + b )( a - b )

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Now ,

( 5m + 3 )( 5m - 3 ) = 0

5m + 3 = 0 or 5m - 3 = 0

5m = -3 or 5m = 3

m = -3/5 or m = 3/5

I hope this helps you.

: )

Answer 2

Hello !!




25M² = 9



25M² - 9 = 0


(5M)² - (3)² = 0



We know that , ( A)² - ( B )² = ( A + B )(A-B).



So,


(5M)² - (3)² = 0


( 5M + 3 ) ( 5M - 3 ) = 0


( 5M + 3 ) = 0 OR ( 5M - 3 ) = 0



M = -3/5 OR M = 3/5.