Question

Решите пожалуйся 3 и 5 задание)заранее спасибо

Answer 1

(2х-3)^2=(2х-5)(2х+5)-2
4х^2-12х^2+9=2х^2-5^2-2
-8х^2+9=2х^2-5^2-2
-8×^2-2×^2=-9-25-2
-10х^2=-36
х^2=18/5
х=324/25

Answer 2

3.
${(2x - 3)}^{2} = (2x - 5)(2x + 5) - 2 \\ 4 {x}^{2} - 12x + 9 = 4 {x}^{2} - 25 - 2 \\ - 12x = - 36 \\ x = 3$
5.
$9 {x}^{2} + {y}^{2} - 6xy > - 3 \\ 9 {x}^{2} - 6xy + {y}^{2} = {(3x - y)}^{2} \\ {(3x - y)}^{2} > - 3$