Question

помогите пожалуйста решить эти уравнения ​

Answer 1

$x^{2} -4=0\\x^{2} =4\\x=2\\x=-2$

$25-9a^{2} =0\\\\-9a^{2}=-25\\9a^{2}=\frac{25}{9}\\a=\frac{5}{3} \\a=-\frac{5}{3}$

$(3b-5)^{2} -49=0\\(3b-5-7)(3b-5+7)=0\\(3b-12)(3b+2)=0\\3(b-4)(3b+2)=0\\(b-4)(3b+2)=0\\b-4=0\\3b+2=0\\b=4\\b=-\frac{2}{3}$

$(2x-3)^{2} -(x+4)^{2} =0\\(2x-3-x-4)(2x-3+x+4)=0\\(x-7)(3x+1)=0\\x-7=0\\3x+1=0\\x=7\\x=-\frac{1}{3}$