exam Maths Puzzle Numerical Ability

Please help me solve this problem.

5x^2-19x-10

(i am not sure how to sqaure something on the computer so i made ^2=raised to the 2nd power)

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exam Other Question

The ratio of the length of a side of one square to that of another square is 4:7. A side of the smaller square is 12 ft. Find the length of a side of the larger square. Simplify


7a/a-b
______
4b/a + b