Anonymous
Anonymous asked in Science & MathematicsMathematics · 3 months ago

How do you solve this and explanation please?

Attachment image

3 Answers

Relevance
  • 3 months ago

    x^2 + 3x - 10 = 0

    (x + 5)(x - 2) = 0

    x = 2

  • rotchm
    Lv 7
    3 months ago

    The area is (x+3)*x which must equal 10. 

    You can try a few good guesses: If x = 0 do you get 10?

    If x = 1...? Etc.  

    Or algebraically:  expand (x+3)*x to get x² + 3x. Thus x² + 3x = 10. Rewrite as

     x² + 3x - 10 = 0.

    Now just solve this by factoring or quadratic eqs.

    Done!

    Hopefully no one will spoil you the answer. That would be very irresponsible of them. 

  • ted s
    Lv 7
    3 months ago

    x² + 3x - 10 = (x+ 5 ) ( x - 2) = 0 when x = 2

Still have questions? Get your answers by asking now.