![]() If you misunderstand something I said, just post a comment. ![]() I can see that -12 * 1 makes -11 which is not what I want so I go with 12 * -1. Substitute the values a 1 a 1, b 5 b - 5, and c 6 c 6 into the quadratic formula and. I can clearly see that 12 is close to 11 and all I need is a change of 1. Use the quadratic formula to find the solutions. My other method is straight out recognising the middle terms. Here we see 6 factor pairs or 12 factors of -12. What you need to do is find all the factors of -12 that are integers. I use a pretty straightforward mental method but I'll introduce my teacher's method of factors first. So the problem is that you need to find two numbers (a and b) such that the sum of a and b equals 11 and the product equals -12. This hopefully answers your last question. The -4 at the end of the equation is the constant. Make sure that a 1 (if a 1, multiply through the equation by before.
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