book Maths Puzzle Numerical Ability

7. The sum of two numbers is 17 and the sum of their square is 145. Find the larger number.
a. 10 b. 11 c. 8 d. 9 e. none
The answer is D, but how? Please help me prepare for my

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book Other Question

Please Factor the following 4 problems

21X^4 + 18X^2 + 36X^3

3T^2 - 5T - 2T^4

-3A^10 + 9A^5 - 6A^15

9M^3 - 7M^4 + 8M^2

Thank You for your help A piggy bank contains 5-centavo and 10-centavo coins amounting to PHP 30.50. If there are 19 more 5-centavo coins than 10-centavo coins, how many coins are in the piggy bank?