Answer:
(7w + 9x)(7w - 9x)
Step-by-step explanation:
Given expression;
49w² - 81x²
Now to solve the problem;
49w² - 81x² = 7²w² - 9²x²
Using differences of two squares;
x² - y² = (x + y)(x - y)
So;
7²w² - 9²x² = (7w + 9x)(7w - 9x)
-3(k+7)-5k+4=23
-3k-21-5k+4=23
Get rid of the numbers that aren't being multiplied by k:
-3k-5k=23+21-4
Add like things:
-8k=40
Divide by -8 on both sides to get k by itself and to make the equation even:
k=-5
Area should be 80
0.5x20x8
A) 15t-4 is your answer. Let me know if you have any other questions :)
Answer:
the LCD is a) (2x+1)(x-3)
Step-by-step explanation:
step 1.)
factorise: 2x²+1- 5x-3 becomes (2x+1)(x-3) when you factorise it and the 2x+1 stays (2x+1).
step 2.)
since 2x+1 are in both denominators you only write it once and don't forget to include x-3 as an LCD
therefore (2x+1)(x-3) is the LCD.
