2. Prove by contradiction: Proposition. If a, b € Z, then a² – 4b – 3 ‡ 0. (Hint: use a result we showed previously: if

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2 Prove By Contradiction Proposition If A B Z Then A 4b 3 0 Hint Use A Result We Showed Previously If 1 (189.22 KiB) Viewed 13 times

2. Prove by contradiction: Proposition. If a, b € Z, then a² – 4b – 3 ‡ 0. (Hint: use a result we showed previously: if a² is odd, then a is odd.) 3. Prove by contradiction: Proposition. If f(x): = 2x + 3 x + 2 9 then for every x ≤ R, ƒ(x) ‡ 2.