factorising quadratic equations
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Original post by z_o_e
Yeah thats right
Original post by Ayaz789
Yeah thats right
This was different but gave it a go.
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Original post by z_o_e
Yeah thats right, now solve it
Original post by Ayaz789
Yeah thats right, now solve it
Think I understand now
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Original post by z_o_e
Yeah thats fine
Original post by Ayaz789
Yeah thats fine
How would I do these rectangles ?
Just need a bit of working out and steps and ill do the answer myself
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Original post by z_o_e
How would I do these rectangles ?
Just need a bit of working out and steps and ill do the answer myself
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Just need a bit of working out and steps and ill do the answer myself
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And the area = base* height
Therefore (2x)(x+7) = 520 and solve for x
Original post by Ayaz789
so the area of the first triangle = 520
And the area = base* height
Therefore (2x)(x+7) = 520 and solve for x
And the area = base* height
Therefore (2x)(x+7) = 520 and solve for x
Don't understand this. :/
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Original post by z_o_e
Oh sorry i mean the area of the rectangle =520
And 2x(x+7) =520
(edited 7 years ago)
Original post by Ayaz789
Oh sory i mean the area of the rectangle =520
And 2x(x+7) =520
And 2x(x+7) =520
So it's 2x^2 + 15 = 520
Then I minus 15 from both sides?
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Original post by z_o_e
2x^2+14x & solve it like a quadratic by doi g minus 520 from both sides
(edited 7 years ago)
Original post by Ayaz789
2x^2+14x & solve it like a quadratic by doi g minus 520 from both sides
Finding the factor bit quiet hard.
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Original post by Ayaz789
Divide everything by 2 to get x^2+7x-260=0
Oh okay.
Why do I divide it by 2?
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Original post by z_o_e
Just to make it a lot easier to factorise!
Original post by Ayaz789
Just to make it a lot easier to factorise!
done
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Original post by z_o_e
Yep and you cannot have a negative x value as x has to be postive!
Original post by Ayaz789
Yep and you cannot have a negative x value as x has to be postive!
Oh so X is always positive?
Also you know this one have I started this alright?
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Original post by z_o_e
Oh so X is always positive?
Also you know this one have I started this alright?
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Also you know this one have I started this alright?
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Expand the whole bracket! x^2+11x+24
Original post by z_o_e
Oh so X is always positive?
Also you know this one have I started this alright?
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Also you know this one have I started this alright?
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X is positive in this case because it's a distance, and you can't have a negative distance!
Have you heard of FOIL? You also need to multiply x by 8 and x by 3
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