Determine two of the values of b so that expression x^2 +bx -12 can be factored
2 answers
Just work it out by using diff. factors of 12. Also one binomial will be subtraction and the other addition.
x^2 +bx -12
The discriminant is b^2+48
So, you need b^2+48 to be a perfect square.
1+48 = 49, so b = ±1 works
16+48=64, so b = ±4 works
121+48 = 169, so b = ±11 works
The discriminant is b^2+48
So, you need b^2+48 to be a perfect square.
1+48 = 49, so b = ±1 works
16+48=64, so b = ±4 works
121+48 = 169, so b = ±11 works
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