Algebra

What are the factor of the following trinomial?

f^2 + 3f - 10

a)(f - 5)(f - 2)
b)(f + 5)(f - 2)
c)(f + 5)(f + 2)
d)(f - 5)(f + 2)

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  1. Do a mental calculation as follows and make you choice accordingly:
    a) -5*(-2)=+10
    b) -5*(-2)=-10, 5f-2f=+3f
    c) +5*(+2)=+10
    d) -5*(+2)=-10, -5f+2f=-3f

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