factorise this question with proper answer
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m² - 3m - 70
= m² - ( 10 - 7 )m - 70 [ • 70 = 10 × 7 ]
= m² - 10m + 7m - 70
= m ( m - 10 ) + 7 ( m - 10 )
= ( m - 10 ) ( m + 7 ) [ • Required answer ]
[ By middle term method ]
= m² - ( 10 - 7 )m - 70 [ • 70 = 10 × 7 ]
= m² - 10m + 7m - 70
= m ( m - 10 ) + 7 ( m - 10 )
= ( m - 10 ) ( m + 7 ) [ • Required answer ]
[ By middle term method ]
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m2 - 7m- 10m - 70=0
m(m-7)- 10(m-7)=0
(m-10) (m-7)=0
either m=10 or m=7
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