find the value of polynomial 4 x ² - 5 x + 9, when X is equals to 1/2
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if x = 1/2
4x² - 5x + 9 = 4×(1/2)² - 5×(1/2) + 9
⇒ 4 × 0.25 - 2.5 + 9
⇒ 1 - 2.5 + 9
⇒ 7.5
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