Question

see the pic.................
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Answer 1

Step-by-step explanation:

2x^2+x-1=0

2x^2+2x-x-1=0

2x (x+1)-1 (x+1)

(x+1)(2x-1)=0

so here it is clear that

(2x-1) is also a factor of 2x^2+x-1