Answer: May had 3x² + 6x + 9 Php saved from his allowance. If he used some of this money to buy a gift worth 10x + 3 for his father's birthday, we can find out how much he has left by subtracting the cost of the gift from the amount he had saved.

Step-by-step explanation:

So, we can use the following equation:

3x² + 6x + 9 - (10x + 3) = remaining amount

Simplifying this equation:

3x² + 6x + 9 - 10x - 3 = remaining amount

3x² - 4x + 6 = remaining amount

So May has 3x² - 4x + 6 Php remaining after buying the gift for his father's birthday.

Answer:

3x²-4x+6=0

Step-by-step explanation:

Principle: Subtraction of Polynomials

May's Saved: 3x²+6x+9

Gift's worth: 10x+3

(3x²+6x+9) - (10x+3) = 0

(3x²+6x+9) + (-10x-3) = 0

3x²-4x+6 = 0