64x^2-121
Rewrite 64x^2 as 8x^2
Rewrite 121 as 11^2
Now you have 8x^2-11^2
Use the difference of squares formula, a^2- b^2 = (a+ b)( a-b) where a= 8x and b = 11
Answer is:
(8x+11)(8x-11)
A) The first step needs 100 bricks, the second needs 98, the third needs 96, and so on. Therefore the number of bricks for the nth step is: a_n = a_1 + d(n-1), where a_1 = 100 (the first term), d = -2 (difference).
a_n = 100 - 2(n-1) = 102 - 2n, and for the 30th step, a_30 = 102 - 2*30 = 42. So the top step will need 42 bricks.
b) The total staircase will need: 100 + 98 + 96 + ... + 44 + 42, and there are n = 30 terms. Using the formula for the sum of an arithmetic sequence:
S = (a_1 + a_n)*n/2 = (100 + 42)*30/2 = 2130
Therefore, 2130 bricks are required to build the entire staircase.
1.Know the order of operations.<span> (pemdas)
</span>2. Start by solving all of the terms in parentheses.
3.Solve the exponents.
4.Solve the multiplication problems in your expression.
<span>5.Move on to <span>division
</span></span>6.Add.
7.Subtract.
8.Review your expression.
Answer:
4x - 12y = -1
Step-by-step explanation:
Standard form Ax +By = C
12y = 4x + 1
0 = 4x - 12y +1 Substract 12y from both sides
-1 = 4x - 12y as 4x - 12y = -1 Substract -1 from both sides
All I can see is adding all the like terms. If thats whats its asking its 2a-6b+6c.
