Question

пж быстрее дам 10 балов

Answer 1

Ответ:

1. a)  $(x-8)^{2}$ = $x^2-16x+64$

б) $\left(5y+4\right)^2 = 25y^2+40y+16$

в) $\left(2x-7y\right)^2 = 4x^2-28xy+49y^2$

г) $\left(0.3x+9\right)^2 = 0.09x^2+5.4x+81$

д) $\left(4n+0.05x\right)^2 = 16n^2+0.4nx+0.0025x^2$

е) $\left(a^4-b^2\right)^2 = a^8-2a^4b^2+b^4$

2. $\left(6x-1\right)^2-3x\left(9x-2\right)=\left(3x+4\right)^2$

$9x^2-6x+1=9x^2+24x+16$

$9x^2-6x+1-1=9x^2+24x+16-1$

$9x^2-6x=9x^2+24x+15$

$9x^2-6x-\left(9x^2+24x\right)=9x^2+24x+15-\left(9x^2+24x\right)$

$\frac{-30x}{-30}=\frac{15}{-30}$

$x=-\frac{1}{2}$