Question

100-у²=0


36-12х+х²=0


х+6 дробь 2 - х-7 дробь 7

помогите, пожалуйста

Answer 1

$100 - {y}^{2} = 0 \\ {(10)}^{2} - {y}^{2} = 0 \\ (10 - y)(10 + y) = 0 \\ y = 10 \\ y = - 10$$36 - 12x + {x}^{2} = 0 \\ {x}^{2} - 12x + 36 = 0 \\ d = {( - 12)}^{2} \times - 4 \times 1 \times 36 = 144 - 144 = 0 \\ x = \frac{12}{2} = 6$$\frac{x + 6}{2} - \frac{x - 7}{7} = 4 \\ \frac{7x + 42}{14} - \frac{2x - 14}{14} = 4 \\ \frac{5x +56}{14} = 4 \\ 5x + 56 = 56 \\ 5x = 0 \\ x = 0$