anonymous
  • anonymous
how to solve this quadratic 143 = (9+2x)(7+2x)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
-4x^2-32x+80=0 x=-10 x=2
anonymous
  • anonymous
How did you get negatives when everything in the parenthesis is positive?
anonymous
  • anonymous
first multiply (9+2x) and (7+2x) then subtract 143 from both sides u will get the quadratic equation in standard form, then solve it with quadratic formula.

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campbell_st
  • campbell_st
expand the right hand side 143 = 4x^2 +32x + 63 subtract 143 from both sides 4x^2 + 32x - 80 = 0 factorising 4(x^2 + 8x - 20) = 0 this factorises to 4(x+10)(x -2)=0 x = -10, 2

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