Question

from y² + 5 y - 7, subtract y² - 3 y - 4​

Answer 1

${y}^{2} + 5y - 7 - ( {y}^{2} - 3y - 4) \\ {y}^{2} + 5y - 7 - {y}^{2} + 3y + 4 \\ {y}^{2} - y {}^{2} + 5y + 3y - 7 + 4 \\ 8y - 3$