Respuesta :

mhanifa

Answer:

We know that:

  • A = lw

Factorize the expression for the area and find the missing side

< 10 >

Given:

  • A = x² + 10x + 21
  • w = x + 3

Find l:

l = A/w

l = (x² + 10x + 21)/(x + 3) =

    (x + 3)(x + 7)/(x + 3 =

    x + 7

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< 11 >

Given:

  • A = x² + 2x - 8
  • l = x + 4

Find w:

w = A/l

w = (x² + 2x - 8)/(x + 4) =

      (x + 4)(x - 2)/(x + 4) =

      x - 2