Example: Is (5,2) a solution to <span>2x + 5y = 20? Subst. 5 for x and 2 for y:
2(5) + 5(2) = 10 + 10 = 20 Yes, (5,2) is a solution.</span>
Answer:4x^2-9
Step-by-step explanation:
By using the FOIL method we multiply 2x by 2x, 2x by -3, 3 by 2x, and 3 by -3.
After doing this we are left with 4x^2-6x+6x-9
The -6x and 6x cancel each other out leaving just 4x^2-9
Answer:
A piecewise function.
Step-by-step explanation:
The problem you showed is a <em>piecewise function.</em>
In this problem, you have to plug in 3 for the value x.
However, if you take a look at the conditions that value x has, it never says that x can equal 3. <em>Thus, this function cannot be true.</em>
<em>Way to check this input is undefined: </em>
Plug in 3 for the variable x. On the first function, your output will be 4. On the second function, your output will be 8.
According to the definition of a function, a function can have many inputs but only one output. In this case, this function has one input, that is 3, but produces two outputs.