Question

Como eu resolvo isso? (Sem bhaskara)

Answer 1

a) ( x - 5 ) • ( x - 6 ) = 30
x2- 6x - 5x + 30 = 30
x2 - 11x = 30 - 30
x2 - 11x = 0
x ( x - 11 ) = 0
x = 0
x - 11 = 0
x = 11

b) ( x + 3 ) • ( x + 4 ) = 7• ( x + 6 )
x2 + 4x + 3x + 12= 7x + 42
x2 + 7x - 7x = 42 - 12
x2 = 30
x = + ou - √30