Question

(4x+5)²-16=0 помогите срочно​

Answer 1

Ответ:

(4х+5-4)(4х+5+4) = (4х+1)(4х+9) = 16х²+36х+4х+9 = 16х²+40х+9 = 0

х1 = -9/4 = -2,25

х2 = -1/4 = -0,25

Answer 2

$(4x + 5) {}^{2} - 16 = 0 \\ (4x + 5) {}^{2} - 4 {}^{2} = 0 \\ (4x + 5 - 4)(4x + 5 + 4) = 0 \\ (4x + 1)(4x + 9) = 0$

1)

$4x + 1 = 0 \\ 4x = - 1 \\ x = - 1 \div 4 \\ x = - 0.25$

2)

$4x + 9 = 0 \\ 4x = - 9 \\ x = - 9 \div 4 \\ x = - 2.25$

ответ:

$x1 = - 2.25 \\ x2 = - 0.25$