Question
In right triangle \( \mathrm{ABC}, \mathrm{m} \angle A=90^{\circ}, \sin B=2 x-0.28 \), and \( \cos C=4 x+0.16 \). Solve for \( x \).
Ask by Willis Peterson. in the United States
Jan 23,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
\( x = -0.22 \)
Solution
To solve for \( x \) in the given right triangle \( \mathrm{ABC} \) with \( \angle A = 90^{\circ} \), \( \sin B = 2x - 0.28 \), and \( \cos C = 4x + 0.16 \), we can use the trigonometric identities for sine and cosine in a right-angled triangle.
Given:
- \( \angle A = 90^{\circ} \)
- \( \sin B = 2x - 0.28 \)
- \( \cos C = 4x + 0.16 \)
We know that in a right-angled triangle, \( \sin B = \cos C \) because the sine of an angle is equal to the cosine of its complementary angle.
Therefore, we can equate \( \sin B \) and \( \cos C \) to solve for \( x \):
\[ 2x - 0.28 = 4x + 0.16 \]
Now, we can solve this equation to find the value of \( x \).
Solve the equation by following steps:
- step0: Solve for \(x\):
\(2x-0.28=4x+0.16\)
- step1: Move the expression to the left side:
\(2x-4x=0.16+0.28\)
- step2: Add and subtract:
\(-2x=0.16+0.28\)
- step3: Add and subtract:
\(-2x=0.44\)
- step4: Change the signs:
\(2x=-0.44\)
- step5: Divide both sides:
\(\frac{2x}{2}=\frac{-0.44}{2}\)
- step6: Divide the numbers:
\(x=-\frac{11}{50}\)
The solution to the equation \(2x - 0.28 = 4x + 0.16\) is \(x = -\frac{11}{50}\) or \(x = -0.22\).
Reviewed and approved by the UpStudy tutoring team
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Mind Expander
In a right triangle, the sum of the angles is always 180 degrees. Given that \( \angle A = 90^\circ \), we can deduce that \( \angle B + \angle C = 90^\circ \). This means that \( \sin B = \cos C \). You are given: \[ \sin B = 2x - 0.28 \] \[ \cos C = 4x + 0.16 \] Since \( \sin B = \cos C \), we can set the two expressions equal to each other: \[ 2x - 0.28 = 4x + 0.16 \] To solve for \( x \), first, let's rearrange the equation: \[ 2x - 4x = 0.16 + 0.28 \] \[ -2x = 0.44 \] Now, divide by -2: \[ x = \frac{0.44}{-2} = -0.22 \] So, the solution for \( x \) is: \[ \boxed{-0.22} \]