Question

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41.) If (3x-15°) and (x+5°) are complementary angles, find the angles.

42.) Expand (2x-3y+z)² using suitable property.

43.) Express x in terms of y, in the equation 7x-3y=15. Find the value of y if x=0.​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

41. (3x-15°)+(x+5°)=90°

4x-10=90

4x=100

x=25°

/ 1 = 3×25-15°

/ 1 = 75-15°

/ 1 = 60°

/ 2 = 25+5°

/ 2 = 30°

$42. \: (2x - 3y + z)^{2} \\ ({a + b + c ) }^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2 ab+ 2 bc+ 2ac \\ {(2x)}^{2} + { (- 3y)}^{2} + ({z})^{2} - 12xy - 6yz + 4xz \\ {4x}^{2} + {9y}^{2} + {z}^{2} - 12xy - 6yz + 4xz$