3 different problems.
2 answers:
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Answer:
Step-by-step explanation:
Given
x - = 9 ← square both sides
(x - )² = 9²
x² - 2 + = 81 ( add 2 to both sides )
x² + = 83
Now
(x + )² = x² +
+ 2, thus
x² + = 83 + 2 = 85
(x + )²= 85 ( take the square root of both sides)
x + =
Answer:
<h2>A = (1,-5)</h2>Step-by-step explanation:
Let the midpoint of the two points A (x₁, y₁) and B(-5, 5) be M(2, 0)
Using the formula for calculating the midpoints of two coordinates
(X₁, Y₁) =
Given if (X₁, Y₁) is the midpoint, then X₁ = 2, Y₁ = 0
x₂ = -5 and y₂ = 5
Substituting this given values into the equation above to get the unknown coordinate;
Similarly;
The coordinate of A = (1,-5)