Question

¿como se resuelve 76×2=(x+5) + (x-2) × x ?

Answer 1

76*2 = ( x + 5 ) + ( x - 2 )*x
152 = x + 5 + x² - 2x
 0 = x² - 2x + x + 5 - 152
 0 = x² - x - 147

x =  [1 +- √ (1 +4*147) ] / 2 = [ 1 +- √ 589 ] / 2 = [ 1 +-  24,3 ] / 2 
x1 = 12,65                  x2 = -11,65