Question

Ajutati'ma va rog la acest exercitiu, dar cu tot cu rezolvare:
(x-5)(2x-5)-(2x-7)la a doua = 2(1-xla a doua)

Answer 1

2x²-5x-10x+25-4x²+28x-49=2-2x²
2x²+2x²-4x²+13x=2+24
4x²-4x²+13x=26
13x=26
x=26/13
x=2

Answer 2

(x-5)(x+5)-(2x-7)²=2(1-x)²⇒
(x²-5x+5x-25)-[(2x)²-2×2x×7+7²]=2(1²-2x+x²)⇒
(x²-25)-[(4x)²-4x+49]=2-4x+2x²⇒
x²-25-4x²+4x+49-2+4x-2x²⇒
-5x²+8x+22=0