Open Middle®
Directions: Using the digits 0 to 9, at most one time each, place a digit in each box so that the quadratic is factorable.
Hint
What types of numbers do you add to equal an odd number?
What types of numbers do you multiply to equal an even number? An odd number?
What types of numbers do you multiply to equal an even number? An odd number?
Answer
There are many answers including:
1x^2 + 17x + 72
2x^2 + 17x + 35
4x^2 + 17x + 18
7x^2 + 17x + 06
1x^2 + 17x + 72
2x^2 + 17x + 35
4x^2 + 17x + 18
7x^2 + 17x + 06
Source: Mark Baethke
3x^2+17x+10