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Mathematics
Mirabel
17 September, 19:40
Factor 2m2 - m - 21
+2
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Victor Francis
17 September, 20:26
0
(2m-7) (m+3)
Step-by-step explanation:
hello:
2m² - m - 21
∆ = b²-4ac a=2 and b = - 1 and c = - 21
∆ = (-1) ²-4 (2) (-21) = 169 = 13²
m1 = (-b+√∆) / 2a = (1+13) 4 = 14/4 = 7/2
m2 = (-b-√∆) / 2a = (1-13) 4 = - 12/4 = - 3
the factorization is : a (m-m1) (m-m2)
2 (m-7/2) (m+3) = (2m-7) (m+3)
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