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o-na [289]
3 years ago
9

Factorising Quadratics

Mathematics
2 answers:
umka21 [38]3 years ago
5 0
Quadratic formula where:
ax ^{2}  + bx + c
\frac{ - b + { \sqrt{b^{2} - 4ac } }}{2a}
\frac{ - b -  \sqrt{b { }^{2} - 4ac } }{2a}
do both do get the roots of the equation
Ulleksa [173]3 years ago
3 0

Answer:


Step-by-step explanation:

A short answer is that you cannot factor this the way you are trying to do it. What to do to go on is a question. You could use the quadratic formula to get some sort of answer but if factoring is your only option, forget about it.

Here's how you can check.

  • a = 12
  • b = 1
  • c = -15

There is a part of the quadratic solution is the sqrt(b^2 - 4*a*c). In order to be factorable, this sqrt must result in a perfect square.

sqrt(1 - 4(12)(-15) ) = sqrt( 1 - - 720) = sqrt(721)

This is anything but a perfect square. (721 does factor, however, into 7 * 103). I03 is prime. So the long and short of it is, there's no way it will factor.

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