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Arrange the steps in the correct order to solve this trigonometric equation:
[tex]\[
2 \sin^2 x - \sin x - 1 = 0 \text{ for } 0^{\circ} \leq x \leq 90^{\circ}
\][/tex]
1. Substitute [tex]\(\sin x = u\)[/tex]
2. [tex]\(2u^2 - u - 1 = 0\)[/tex]
3. Factor: [tex]\((2u + 1)(u - 1) = 0\)[/tex]
4. Solve for [tex]\(u\)[/tex]: [tex]\(u = -\frac{1}{2}\)[/tex] and [tex]\(u = 1\)[/tex]
5. Replace [tex]\(u\)[/tex] with [tex]\(\sin x\)[/tex]: [tex]\(\sin x = -\frac{1}{2}\)[/tex] and [tex]\(\sin x = 1\)[/tex]
6. Find [tex]\(x\)[/tex]: [tex]\(x = 90^{\circ}\)[/tex] (within the given range)