Question

Решите неравенство X^2<-2x+63

Answer 1

решение на фотографии

Answer 2

${x}^{2} < - 2x + 63 \\ {x}^{2} + 2x - 63 < 0 \\ {x}^{2} + 9x - 7x - 63 < 0 \\ x(x + 9) - 7(x + 9) < 0 \\ x + 9 < 0 \\ x - 7 > 0 \\ \\ x + 9 > 0 \\ x - 7 < 0 \\ \\ x < - 9 \\ x > 7 \\ x > - 9 \\ x < 7$