Question

Пожалуйста срочно решите эти уравнения и прикрепите фото с решением

Answer 1

$1. \sqrt{39 - 4x} = 7 => 39 - 4x = 49 => 4x = -10 => x = -2.5\\2. \sqrt{72-21x} = -x => \left \{ {{72-21x = x^2} \atop {x\leq 0}} \right. => \left \{ {{x_1 = 3, x_2 = -24} \atop {x\leq 0}} \right. => x = -24\\3. \sqrt{x+25} = x + 5 => \left \{ {{x+25 = x^2 + 10x + 25} \atop {x \geq -5}} \right. => \left \{ {{x_1 = -9, x_2 = 0} \atop {x \geq -5}} \right. => x = 0\\4. \sqrt{2x^2-6x+9} = \sqrt{2x^2+3x-18} => \left \{ {{2x^2-6x+9 = 2x^2+3x-18} \atop {2x^2-6x+9 \geq 0}} \right. => 9x = 27 =>\\=>x = 3$

Answer 2

Решение задания прилагаю