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\[x^2 + 5x - 84\]
Quadratic formula:|dw:1378152820900:dw| a:1 b:5 c:-84 Plug in the values and solve. :)
Not needed for this one, uri D: You can factor it cleanly. When the coefficient of the x^2 term is only a 1, you need to find two factors of the constant (number) that add up to the coefficient of the x term. So for your problem, it would be two factors of 84 that add up to 5. Once you find those two factors, your answers are like this: (x+ factor one)(x + factor two)
But he says he has to do it using Quadratic formula..no? @Kyle15
Just says quadratic equations.
No, he said he needs to solve quadratic equations.
My paper says Solve and find the Exact answer of these quadratic equations.
@Psymon 's way is easier tho :)
I find Quadratic more easier but alrighttt, :)
Right. So for this problem, all we need to do is find two factors of negative 84 that add up to positive 5. So do you think you can find two numbers that multiply to make -84 but also add to make positive 5?
And you can do this problem in 2 seconds without quadratic formula, just depends on how fast you are at seeing the factors xD
I cannot find the multiples that will add up to 5 that also multiply to get -84....
Alrighty, lets see if we can help ya out.
Am I just not seeing it? Lol. I must be having a complete brain fart.
|dw:1378153134952:dw| Yoiu can break down your number like this and try to eventually find the 2 numbers. I found 12 and 7.
Sorry, meant to type 12 and 7 in the pic xD
Ohh! Gotcha! Thanks!xD
But once you find 12 and 7, you need to choose one of the numbers to be negative and one of them to be positive. Because in the end, these numbers must make NEGATIVE 84. At the same time, these two numbers must add up to a positive 5. That being said, if you want the addition of the two numbers to stay positive, you must choose the larger number of the two to remain positive. This means your two numbers are 12 and -7. Now as mentioned above, now we can just plug these in: (x+12)(x-7) These would be your factors. Now if you had to actually explicitly solve for x, you would set every factor you have equal to 0 liek so: x + 12 = 0 x - 7 = 0 SOlving for x gives us -12 and 7 as our values of x.
Yeah, I was just lost on remembering the process lol. Thanks!
Yeah, np :3