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murzikaleks [220]
3 years ago
13

25x2 - 24x + 4 tại x=5

Mathematics
1 answer:
natima [27]3 years ago
5 0
<h2>Evaluating Expressions</h2><h3>Answer:</h3>

509

<h3>Step-by-step explanation:</h3>

25x^2 -24x +4 \text{ when } x = 5

25x^2 -24x +4 \\ 25(5)^2 -24(5) +4 \\ 25(25) -24(5) +4 \\ 625 -120 +4 \\ 509

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\cot^2135^o-\sin210^o+5\cos^2225^o=(-1)^2-\left(-\dfrac{1}{2}\right)+5\cdot\left(-\dfrac{\sqrt2}{2}\right)^2\\\\=1+\dfrac{1}{2}+5\cdot\dfrac{1}{2}=1\dfrac{1}{2}+2\dfrac{1}{2}=4

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