Question

$25 {x}^{2} - (x + 4) ^{2} = 0$
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Answer 1

(5x)²-(x+4)²=0

(5x-x-4)(5x+x+4)=0

(4x-4)(6x+4)=0

4*(x-1)*2*(3x+2)=0

(x-1)(3x+2)=0

x1=1

x2= -2/3