samarah121 samarah121
  • 02-04-2020
  • Mathematics
contestada

Expand and simplify (4 + √7)(2 - √7).

Respuesta :

Officialalehpeter
Officialalehpeter Officialalehpeter
  • 02-04-2020

Answer:

1 - 2√7

Step-by-step explanation:

( 4 + √7)(2 - √7)

Open the brackets with

( 4+ √7)

= 4( 2 - √7) + √7(2 - √7)

= 8 - 4√7 + 2√7 - √49

= 8 ( -4 + 2)√7 - √49

= 8 - 2√7 - 7

= 8 - 7 - 2√7

= 1 - 2√7

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