Answer:
{-3, 3}
Step-by-step explanation:
x^2 - 9 = 0 can be written in factored form as (x -3)(x + 3) = 0. Letting each factor equal zero separately and solving for x, we get x: {-3, 3}
<span>a. 93.312 cm
im sure thats the answer
</span>
Remark
The upper answer is correct. Any time you are dealing with addition or subtraction and one of the numbers is irreducible and remains irrational no matter what you do, then the entire addition or subtraction of terms remains irrational.
For the second one that you did not answer, it works the same way as the comment says.
3√2 * 8√18 give two numbers that can be multiplied under the square root sign.
3*8 = 24
√(2*18) = √(36) = 6
The answer is 24*6 = 144
This procedure is the only way I know that you can get a rational result from two irrational factors. In fact it is really quite useful to know. You will use this when you learn how to rationalize the denominator. This exact method is used to do that.
125m-75m+43,875=45,450-175m
We simplify the equation to the form, which is simple to understand
125m-75m+43,875=45,450-175m
We move all terms containing m to the left and all other terms to the right.
+125m-75m+175m=+45.45-43.875
We simplify left and right side of the equation.
+225m=+1.575
We divide both sides of the equation by 225 to get m.
m=0.007
(I’m sorry if I’m wrong I tried)
