
Concept explainers
To Find: Factor of polynomial 5v2+4v−1

Answer to Problem 16WE
Factor of polynomial 5v2+4v−1=(v+1)(5v−1)
Explanation of Solution
Given information: polynomial 5v2+4v−1
Formula used: If the quadratic trinomial ax2+bx+c can be factored into the product (px+q)(rx+s) where p,q,r,s are integers, then
ax2+bx+c=prx2+(ps+qr)x+qs
Setting corresponding coefficients equal gives
a=pr,b=ps+qr,c=qs
Calculation:
polynomial 5v2+4v−1
pr=5
The factorization begins
(v )(5v )
qs=−1
the coefficient of v is positive.
( 1)( −1)( −1)( 1 )
There are some possible factorizations to check
Trial Factorization Linear term of product (v+1)(5v−1) 4v (v−1)(5v+1) -4v
Since the required linear term is v , the first factorization is the correct one
∴5v2+4v−1=(v+1)(5v−1)
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