drewwilson07 drewwilson07
  • 04-04-2016
  • Mathematics
contestada

Factorise and Solve

Factorise and Solve class=

Respuesta :

Panoyin
Panoyin Panoyin
  • 04-04-2016
                     x² + 8x - 20 = 0
            x² + 10x - 2x - 20 = 0
x(x) + x(10) - 2(x) - 2(10) = 0
        x(x + 10) - 2(x + 10) = 0
                  (x - 2)(x + 10) = 0
     x - 2 = 0    or    x + 10 = 0
       + 2 + 2              - 10  - 10
          x = 2        or        x = -10

The answer is B.
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