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• Created on: 08-05-16 14:35
What do the numbers in a quadratic factorisation add and multiply to make? (a)x²-(b)x+(c)=0
Add to make (b) and multiply to make (c).
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(x-4)(x-5)=0
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What does x= in the factorised quadratic: (x-10)(x+1) ?
x=10 and x=-1
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What do you do if you have to work out this harder quadratic? 6x²-5x-6
6x-6=-36. This shows that we want two numbers that multiply to -36 and add to make -5.
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(6) x (-6)=-36. 6x²-9x+4x-6. 3x(2x-3)+2(2x-3). (3x+2)(2x-3). CHECK.
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(3) x (-15) =-45. 3x²-9x+5x-15. 3x(x-3)+5(x-3). (3x+5)(x-3).
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How to do : sinx=1/2
x=sin^-1(1/2). =30°. (draw graph) x=30° x=150°
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6x²-9x+2x-3=0. 3x(2x-3)+1(2x-3)=0. (3x+1)(2x-3)=0. x=1/3. x=3/2.
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Name the methods for drawing a quadratic graph.
Table of values. Calculator. Algebra.
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x=-b±√b²-4ac/2a
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## Other cards in this set

(x-4)(x-5)=0

### Card 3

#### Front

What does x= in the factorised quadratic: (x-10)(x+1) ?

### Card 4

#### Front

What do you do if you have to work out this harder quadratic? 6x²-5x-6