tìm đa thức a biết a) 5x^2-2q 3x-5=
Giải thích
5x2 – 2A + 4x – 5 = A + 4x2 – 6x + 7
3A = 5x2 + 4x – 5 – 4x2 + 6x – 7
3A = x2 + 10x – 12
\(A = \frac{{{x^2} + 10x - 12}}{3}\)
5x2 – 2A + 4x – 5 = A + 4x2 – 6x + 7
3A = 5x2 + 4x – 5 – 4x2 + 6x – 7
3A = x2 + 10x – 12
\(A = \frac{{{x^2} + 10x - 12}}{3}\)