First I will tell you the formula for this, then I will show how we got the formula, then the answer.
Formula -> (x+a)(x-a)=x^2-a^2
We can find this by expanding the 2 ( )
(x+a)(x-a)=x^2+ax-ax-a^2=x^2-a^2
Now we can use this to solve your problem, the 5 is the a in the formula.
(x+5)(x-5)=x^2-5^2=x^2-25. Therefore choosing the 3rd answer choice.
Answer:
The Answer would be The first ab
Step-by-step explanation:
Answer:
x = 30°
Step-by-step explanation:
The tangent and secant from a point outside the circle combined with the radius form a triangle.
The sum of the 3 angles in the triangle = 180°
The angle at the centre of the circle = 60° ( equilateral triangle )
The angle between the tangent and the radius on the circle = 90°, thus
x = 180° - (90 + 60)° = 180° - 150° = 30°
Answer:
A) y = 2x
Step-by-step explanation:
The slopes of perpendicular lines are negative reciprocals.
The given line has slope -1/2.
The negative reciprocal of -1/2 is 2.
The only choice with slope = 2 is choice A.
y = 2x does include point (-1, 2).
Answer: A) y = 2x