exam Maths Puzzle Numerical Ability

One more than the difference between 18 and 7 times a number is -9

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exam Other Question

One number is 14 more than another number. Their product is 351. What re the numbers? I really need help with parabola, and plotting other points for this problem.
Thanks for your help.

1/5x^2 + 2/5x - 4/5