Ответ:
1) x(x+7)+4=(2x+1)(x+4)
x2+7x+4=2x2 + 8x + x + 4
x2 +7x+4 - 2x2 - 8x - x - 4 =0
- x2 - 2x =0
2) x2 - bx + 1 =0
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Ответ:
1) x(x+7)+4=(2x+1)(x+4)
x2+7x+4=2x2 + 8x + x + 4
x2 +7x+4 - 2x2 - 8x - x - 4 =0
- x2 - 2x =0
2) x2 - bx + 1 =0