The answer is -80, i have done all the math and -80 is the answer
Answer:
Step-by-step explanation:
what?
1. Use Difference of squares: a^2-b^2=(a+b)(a-b)
(x+k)(x-k)=0
2. Solve for x and k
x=+-k
k=+-x
The answer is d.61. 66+7=73. 13+8=21. 52+9=61. 10+10=20
