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

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 ???

xToySoldier92 says

Thanks! Great vid

Just helped me with my first maths assignment of the year

daneyalsalehi says

very helpful

nickAclarke says

Cheers mate, Great video

mrblanco101 says

top vid ðŸ™‚

shizerm8 says

i hate maths… fudge sakes… 21/4 same as 2??

lucy798 says

Thank you so much!

Very clear!

PS.You sound like Jude Law =P

averytanyan says

lol when said simple we can understand yet in school teacher say like fish talking to dog

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.

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)

euronymousisdead says

i didnt get the factoring why is it (4x- 21)(x-2)=0

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