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a^2 + 3a - 4 Factor and solve for a

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a^2 + 3a - 4

(a )(a ) ( -1)( +4)

(a-1) (a+4)

Solve:

(a-1)=0

a-1+1=0+1

a=1

Solve:

(a+4)=0

a+4-4=0-4

a=-4