AS Core 1 Maths Problem
Could someone please show me a step by step method for working out this problem using completing the square:
Solve for x and y
y=x^2+2x-4
y=x+2
Thanks
Solve for x and y
y=x^2+2x-4
y=x+2
Thanks
Original post by HelenaEllis
Could someone please show me a step by step method for working out this problem using completing the square:
Solve for x and y
y=x^2+2x-4
y=x+2
Thanks
Solve for x and y
y=x^2+2x-4
y=x+2
Thanks
We don't work like that. Could you should us your working please? A first step might be to form a quadratic in x and make it equal to 0.
Original post by Mr M
We don't work like that. Could you should us your working please? A first step might be to form a quadratic in x and make it equal to 0.
I did this, but not entirely sure i have done it right:
x^2+2x-4=x+2
x^2+x-6=0
(x+1/2)^2-1/4-6
I got x=-1/2+- (square root of 25/4)
Not sure i have done this right though
Original post by HelenaEllis
I did this, but not entirely sure i have done it right:
x^2+2x-4=x+2
x^2+x-6=0
(x+1/2)^2-1/4-6
I got x=-1/2+- (square root of 25/4)
Not sure i have done this right though
x^2+2x-4=x+2
x^2+x-6=0
(x+1/2)^2-1/4-6
I got x=-1/2+- (square root of 25/4)
Not sure i have done this right though
All good but what is the square root of 25/4?
Original post by Mr M
All good but what is the square root of 25/4?
Square root 25/4 is 5/2 so + or - 2.5 as an entire fraction square rooted can be written as √25/√4 hope that helps
Posted from TSR Mobile
Original post by mathscot
Square root 25/4 is 5/2 so + or - 2.5 as an entire fraction square rooted can be written as √25/√4 hope that helps
Posted from TSR Mobile
Posted from TSR Mobile
I was trying to prompt the OP. I wasn't asking for help. By the way your answer is wrong.
Original post by HelenaEllis
Could someone please show me a step by step method for working out this problem using completing the square:
Solve for x and y
y=x^2+2x-4
y=x+2
Thanks
Solve for x and y
y=x^2+2x-4
y=x+2
Thanks
Moved to Maths section
Original post by Mr M
I was trying to prompt the OP. I wasn't asking for help. By the way your answer is wrong.
This is right √25/√4 = + or - 5/2 why do you think it is wrong ?
Posted from TSR Mobile
Original post by mathscot
You shouldn't include a positive or negative sign. The answer is positive by definition.
Original post by Mr M
All good but what is the square root of 25/4?
lol
Posted from TSR Mobile
Original post by Mr M
You shouldn't include a positive or negative sign. The answer is positive by definition.
-3^2 = 9 and 3^2 =9 hence anything square rooted normally could. Be + or - as it is a quadratic you need two answers that's how you get them
Original post by mathscot
-3^2 = 9 and 3^2 =9 hence anything square rooted normally could. Be + or - as it is a quadratic you need two answers that's how you get them
One final time. No.
If you are asked to solve the equation then the answers are .
If you are asked to simplify then the answer is .
If
Unparseable latex formula:
returned both results then there wouldn't be any need for a symbol in the quadratic formula.\sqrt
Original post by Mr M
...
Mirin' clarification.
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