To show: (x+y)² − (x −y)² = 4xy
Using difference of square identity:
Taking left side
hence proved
Answer:
B. 14 square feet
Step-by-step explanation:
just took the test
<span>It is important to know that the sum of the three angles inside a triangle add up to 180 degrees. So then we get the following by adding up all three provided angle measures:
3x + (2x + 20) + (4x - 20) = 180
Some algebraic manipulation follows:
3x + 2x + 20 + 4x - 20 = 180
9x = 180
x = 180/9 = 20
The value of x is 20 degrees.</span>
Answer:
Step-by-step explanation:
When two angles are complementary, their angle lengths add up to 90°.
Therefore, we can make the equation
Now we can solve for x.
Since the measure of ∠4 is just x°, and we know x is 33, that means ∠4 is 33°.
We also have the expression for ∠3, 
. Since we know x is 33, we can substitute it into the expression.
Hope this helped!
I honestly don’t know man but don’t worry, if you get a bad score it won’t matter in 30 years :)
