factorise this m2-23m+42
Answers
Answered by
8
given,
m² - 23m + 42
using the 4th identity , (x+a)(x+b) = x² + x(a+b)+ab,
we will observe that
- 21 × -2 = + 42
and
-21 + -2 = -23
we have,
(m)² + m( -21-2) + -21 × -2
= (m - 21 ) ( m - 2 )
m² - 23m + 42
using the 4th identity , (x+a)(x+b) = x² + x(a+b)+ab,
we will observe that
- 21 × -2 = + 42
and
-21 + -2 = -23
we have,
(m)² + m( -21-2) + -21 × -2
= (m - 21 ) ( m - 2 )
Answered by
15
=M^2-(21+2)m +42
=m^2-21m-2m+42
=m(m-21) -2(m-21)
=(m-2) (m-21)
=m^2-21m-2m+42
=m(m-21) -2(m-21)
=(m-2) (m-21)
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