f(x)= -x^2 + 2x + 15
I search for the coordinates and keep coming up with (-3,5,0) Yes, I am a idiot. Can someone help please?
4 answers
Maybe. What's the question?
Hi, I am looking for the x coordinates only..f(x)= -x^2 + 2x + 15
how did you get 3 numbers?
i already solve this problem somewhere but ill do it again you can either factor or use quadratic formula (-b plus or minus the square root of b-4AC and all of that divided by 2A)
if you factor ignore the negative on the x^2 multiply the 1 x from x^2 times the 15 to get 15x
the 2 numbers that multiply to get 15 and add up to equal 2( because of the 2x ) is 3 and 5 (i know 3 +5=8 but if one had a negative you would get a 2 but don't put a negative sign because of the negative we left out on the x^2)
and using box technique we get (-x +5, and x + 3; there is a neg in front of the x bc we know we will have negative x^2) put the two equation equal to zero and solve for x, plug back into original eqaution and choose only the answer that is equal to zero(sometimes you will get an answer that doesnt)
if you factor ignore the negative on the x^2 multiply the 1 x from x^2 times the 15 to get 15x
the 2 numbers that multiply to get 15 and add up to equal 2( because of the 2x ) is 3 and 5 (i know 3 +5=8 but if one had a negative you would get a 2 but don't put a negative sign because of the negative we left out on the x^2)
and using box technique we get (-x +5, and x + 3; there is a neg in front of the x bc we know we will have negative x^2) put the two equation equal to zero and solve for x, plug back into original eqaution and choose only the answer that is equal to zero(sometimes you will get an answer that doesnt)