Simultaneous Equations 1 Linear 1 Quadratic Example 2


Example 2 – livemaths.co.uk – GCE A Level Maths video tuition. This video demonstrates how to solve simultaneous equations, 1 linear and 1 quadratic. … alevel gce simultaneous equation “a level” elimination core maths tuition tutor livemaths lesson teaching revision

Comments

  1. MissPheonix1 says

    doesnt the 42 turn into a minus, because your minusing it away from both sides to get it into the form of

    4×2-29x+42=0 ???

  2. adamrobarts says

    as a common factor, and we get

    (x – 2)(4x – 21) = 0

    Going from there is pretty simple; since it =0, one of them has to be 0 itself. Do one, the nthe other, and youll have both possibilities.
    Hope this helps anyone that needs it ;P

    PS: Great video, very easy to understand.

  3. adamrobarts says

    Its abit late but incase anyone needs to know, imagine the process of expanding backwards. Normally i dont do it straight away like that;i prefer to break apart the ‘bx’ part first and then factorise separatly. e.g.
    Multiply a and c, find two numbers that are factors AND add up to b. In this case, ‘-21’ and ‘-8’ fit perfectly.
    We proceed to make the equation:
    4x^2 – 8x – 21x + 42 = 0
    Note that ive grouped the easily factorised terms.
    Now:
    4x(x – 2) – 21(x – 2) = 0
    Now take out (x – 2)

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