In x^2=9, you have to square root it, but there's a catch - it's a plus or minus with the square root because it can either be 3 or -3 in this scenario, so
x= +-3=+- sqrt(9)
In x(x-1)=9, we have x^2-x=9 when expanding, which turns into x^2-x-9=0. Using the quadratic formula, we have x=(1+-sqrt(1+36))/2, which is (1+-sqrt(37)/2) for x, and that has 2 solutions given the plus and minus.
For the third one, we have x^2-6x-9=0. Factoring it, we get (x-3)^2=0, and that clearly has only one answer - x=3
Answer:
14. x=30, y=15, z=165
15. x=10, y=25
Step-by-step explanation:
Answer:
22
Step-by-step explanation:
Plug in what you know, and solve.
(4) - 3(-6) = ?
4 + 18 = ? --> 22
*Hey! Hope this was helpful!*
Hello there!
The perimeter is the length of all the sides, combined.
So, if you add all them up, the answer is 60cm.
In this problem, you will have to do some figuring, though.
Brady
Answer:
3
Step-by-step explanation: