Answer:
A = 90
Step-by-step explanation:
We need to find the length of the base
Let EF be the base
length = change in x (since the y's are the same value)
= (9--9) = (9+9) = 18
Now we need to find the height (change in y values)
-7 --2
-7 +2 = -5
But the value is positive because we are finding the distance
height is 5 units
A = bh
A = 18*5
A = 90
Four hundred and six point cero six
Answer:
440m
Step-by-step explanation:
First you would square root the value 12100 to get one of the length of the square.
=110m
A square has four sides so,
110*4=440m
Answer:
x = -4
Step-by-step explanation:
To make this easier to explain and easier to solve, we're going to first multiply the second equation of 9x-7y=-15 by -1 to make the y coefficient positive.
This results in -9x+7y=15.
When we line up the two equations on top of each other now, we'll see that both the first and second equations have opposite y coefficients, which is vital for elimination.
The next step is to add the second equation to the first one. Teachers may tell you to subtract, but I find it easier to add if you make the two y coefficients of negative value to each other.
4x-7y=5
+ -9x+7y=15
___________
-5x+0y=20, or just -5x=20, because you have successfully eliminated the y variable.
From there, you're going to solve like a normal equation (divide both sides by -5) toget you x=-4.
FIND THE PRODUCT (6x-7)^2
(6x-7)(6x-7)= 36x^2-84x + 49 (sum of inner product(-42x) and outer product(-42x)=-84x
FIND THE PRODUCT
(8x-3z)(8x+3z)= 64x^2 -9z^2 (sum of inner product(-24x) and outer product(24x) = 0
USING THE FORMULA (a+b)(a-b)=a^2-b^2 to multiply
(9x-7)(9x+7) = 81x^2 - 49 (sum of inner product(-63x) and outer product(63x) = 0
Note: If using the outer and inner products for the x term is too confusing,
we can alwyas resort to the 'long way'
(6x-7)(6x-7)= 6x(6x-7)-7(6x-7) = 36x^2 -42x -42x + 49 = 36x^2 -84x -49
