Well there is to equations here that must be equal. X+20=4X Four times old means 4X+X=5X.
If you work to simply the problem you get something that looks like this:
X+20=5X
20=4X
x=20/4 or 5 y/o!
Answer:
false
Step-by-step explanation:
hope it helps!
have a good day!
Using the formula for the Pythagorean theorem a^2 +b^2 = c^2, where a and b are the sides and c is the hypotenuse, we can rplace a and b with the side lengths and solve for c.
7^2 + 3^2 = c^2
49 + 9 = c^2
58 = c^2
c = √58 ( Length of hypotenuse)
If you need it as a decimal: √58 = 7.615773 ( Round answer as needed.)
Answer:
x³ − x² + 9x − 9 = 0
Step-by-step explanation:
Imaginary roots come in conjugate pairs. So if 3i is a root, then -3i is also a root.
(x − 1) (x − 3i) (x − (-3i)) = 0
(x − 1) (x − 3i) (x + 3i) = 0
(x − 1) (x² − 9i²) = 0
(x − 1) (x² + 9) = 0
x (x² + 9) − (x² + 9) = 0
x³ + 9x − x² − 9 = 0
x³ − x² + 9x − 9 = 0
