SOLUTION: 1)Jojo was solving the equation 2x^2-6x-7=0 using completing the square. He went through the step 2x^2-6x+(-3)^2=7+(-3)^2 Was he performing the correct solution? 2) The sum of squ

Algebra ->  Equations -> SOLUTION: 1)Jojo was solving the equation 2x^2-6x-7=0 using completing the square. He went through the step 2x^2-6x+(-3)^2=7+(-3)^2 Was he performing the correct solution? 2) The sum of squ      Log On


   

Question 1043402: 1)Jojo was solving the equation 2x^2-6x-7=0 using completing the square. He went through the step 2x^2-6x+(-3)^2=7+(-3)^2 Was he performing the correct solution?
2) The sum of squares of two consecutive integers is 85. What are the integers?
3)The fence around a rectangular playground is 160m long. The area of the lot is 1500m^2. What are the dimensions of the lot?
4) The sides of the square are extended to form a rectangle. One side of the square is extended by 5cm and the other side is 3cm, what is the length of the side of the square
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
1:
2x%5E2-6x-7=0
2%28x%5E2-3x-7%2F2%29=0
NOW complete the square.
2%28x%5E2-3x%2B%283%2F2%29%5E2-7%2F2-%283%2F2%29%5E2%29=0
Keep going.


2:
%28n%29%5E2%2B%28n%2B1%29%5E2=85
Solve!


3:
w and L dimensions.
system%282w%2B2L=160%2CwL=1500%29
-
w%2BL=80
w=80-L
-
%2880-L%29L=1500
80L-L%5E2-1500=0
L%5E2-80L%2B1500=0
Continue solving for L and use it to get w.