$4x^2 - 3x + 7 = 2x^2 + x + 7$
$4x^2 - 2x^2 - 3x - x = 7 - 7$
$2x^2 - 4x = 0$
x(2x − 4) = 0
x = 0 или 2x − 4 = 0
2x = 4
x = 2
Ответ:
$x_1 = 0$;
$x_2 = 2$.

$-5y^2 + 8y + 8 = 8y + 3$
$-5y^2 + 8y - 8y = 3 - 8$
$-5y^2 = -5$
$y^2 = 1$
y = ±1

$10 - 3x^2 = x^2 + 10 - x$
$-3x^2 - x^2 + x = 10 - 10$
$-4x^2 + x = 0$
x(−4x + 1) = 0
x = 0 или −4x + 1 = 0
−4x = −1
x = 0,25
$x_1 = 0$;
$x_2 = 0,25$.

$1 - 2y + 3y^2 = y^2 - 2y + 1$
$3y^2 - y^2 - 2y + 2y = 1 - 1$
$2y^2 = 0$
y = 0