Determine the number that must be added to make each of the following a perfect square trinomial.
1. x²+2x+___
2. r²+2r+___
3. x²-15x+___

Find the solutions of each quadratic equations.
1. 2x² + 8x-10=0
2. x²+3x-18=0

Please, i need the answers now, gonna pass it tomorrow morning. ​