Question

Решите уравнения
4x^2-20=0
2x+8x^2=0

Answer 1

$1) 4x^2-20=0\\ 4x^2=20 mid div 4\\x^2=5\\boxed{x=pmsqrt{5}}\\\2) 2x+8x^2=0\\x(2+8x)=0\\boxed{x=0}\2+8x=0 => 8x=-2 => boxed{x=-frac{1}{4}}$