Attached solutions and challenge question.
So when a variable (which is x, y or whatever letter) is sitting beside a number that means you'll be multiplying.
So 3 multiplied by 5 (since we know x is equal to 5) is 15.
And since we know 3x (which can also be written as 3(5) if that helps) is equal to 15 our math problem would look like this
15 + 8.
So 15 plus 8 is equal to 23.
I hope this helps :)
Let the variable used in the expression be "x".
Since the desired expression should contain 5 terms, therefore the powers of "x" will be as follows:
x^0 , x^1 , x^2 and x^3 where x^0 = 1 and x^1 = x
Now we are given only 3 coefficients to use, so we will have to assume a fourth one.
Assume the fourth coefficient to be 7
It is a convention to write the powers in an expression in descending order, so the expression will be as follows (without coefficients):
x^3 + x^2 + x + constant
Now add the coefficients in any desired order since there are no conditions, the final expression can be written as follows:
3 x^3 + 6 x^2 + 9 x + 7