Question

СРОЧНО ПОМОГИТЕ ДАЮ 50БАЛОВ СРОЧНО НА ФОТО

Answer 1

1. (6x-5)²-(8x+9)²=0

36x²-60x+25-64x²-144x-81=0

-28x²-204x²-56=0

28x²+204x+56=0

7x²+51x+14=0

x=$\frac{-51±\sqrt{51^{2}-4*7*14 } }{2*7}$

x=$\frac{-51±\sqrt{2601-392} }{14}$

x=$\frac{-51±47}{14}$

x1=$\frac{-51+47}{14}=-\frac{2}{7}$

x2=$\frac{-51-47}{14} =-7$

2.(8x-7)(3x-1)²=(8x-7)*(9x²-6x+1)=72x³-48x²+8x-63x²+42x-7=72x³-111x²+50x-7