In Exercise, factor the polynomial or expression. If a polynomial is irreducible, state this. (In Exercise the factoring techniques are specified.)
(Trial and error)
(a) 2x2 − 7x − 4
(c) 2x2 + 7x + 4
(b) 2x2 + 7x − 4
(d) −2x2 − 7x + 4
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