exam Maths Puzzle Numerical Ability

Please show me how to solve and graph this equation. Having several different examples usually helps me to understand since I'm a visual learner. Thanks!

y=x^2+3x+1

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exam Other Question

can u please solve this for me.
the sum of the digit of a two digit number is 11. when the digit are reversed, the new number is increased by 20 which is twice the original number. find the original number? The sum of the digits of a two-digit number is 15. if the digits are reversed, the new number is only 9 more than the original number. What was the original number?