|3y^2-xy=14 |y^2 = 25 |y=5 |y=5
5x^2 - 4x - 1 = 0
D = 16 + 20 = 36
x1 = (4 + 6)/10 = 1
x2 = (4 - 6)/10 = - 1/5 = - 0,2
{х-у=4
<span>{</span>2х+у=2
Выразим х=у+4
2(у+4)+у=2
2у+8+у=2
3у+8-2=0
3у=-6
у=-2
х=-2+4=2
(x + 6)(x + 14) = x^2 + 14x + 6x + 84 = x^2 + 20x + 84
1) (8а² - 5с³)(8а² + 5с³) = 64а² - 25с⁶
2) ( 1\15а² - 1\12х⁴ у⁵ )( 1\15а² + 1\12х⁴ у⁵) = 1\225а⁴ - 1\144х⁸ у¹⁰