Question

Кому не сложно может помочь с 25,это алгебра блиц опрос

Answer 1

Ответ:

$1)x(x + 5)(x - 9) = 0 \\ x( {x}^{2} - 4x - 45) = 0 \\ \\ x3= 0 \\ \\ {x}^{2} - 4x - 45 = 0 \\ x1x2 = - 45 \\ x1 + x2 = 4 \\ \\ x1 = 9 \\ x2 = - 5$

$2) {x}^{2} - 7x = 0 \\ x(x - 7) = 0 \\ x1 = 0 \\ x2 = 7$

$3) {x}^{2} - 64 = 0 \\ (x - 8)(x + 8) = 0 \\ x1 = 8 \\ x2 = - 8$

$4) {43}^{2} - {33}^{2} = (43 - 33)(43 + 33) = 10 \times 76 = 760$