Question

1)(3х-5)(3х+5)-9х²=10х
2)(3х+4)²-(3х-1)(1+3х)=49

Answer 1

1) 9x²+15x-15x-25-9x²=10x
10x=25
x=25÷10
x=2.5
2)  незнаю :3

Answer 2

$1)9x^{2} - 25 - 9x^{2} = 10x$
$- 25 = 10x$
$10x = - 25$

$2)9x^{2} + 24x + 16 - (3x - 1) times (3x + 1) = 49$
$9x^{2} + 24x + 16 - (9x^{2} - 1) = 49$
$9x^{2} + 24x + 16 - 9x^{2} + 1 = 49$
$24x + 17 = 49$
$24x = 49 - 17$
$24x = 32$
$x = frac{4}{3}$