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Factorising Quadratics
Special Cases
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Did I get it? Can I factorise the special cases?
ππβππ+ π π π π π βππβπ ππ π βππ
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Last Objective on Factorisingβ¦.
To be able to make calculations using factorising (without a calculator) Letβs go over all the factorising question types we didβ¦. Then weβll figure out, which of these we must use to be able to make calculations using factorising.
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πππππππππ ππ π βπ π(ππβπ)
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πππππππππ π π +πππ+ππ (π+π)(π+ππ)
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πππππππππ π π βππ+π (πβπ) π
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πππππππππ π π βππβππ (πβππ)(π+π)
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πππππππππ π+ π π βππ π π βππ+π (πβπ)(πβπ)
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πππππππππ π π β π π (πβπ)(π+π)
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πππππππππ ππ π βπππβππ π( π π βππβππ) π(πβπ)(π+π)
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Taking out a common factor Difference of Two Squares
We will be using TWO of these factorising methods to be able to work out the following without a calculator: Taking out a common factor π π +ππ Γ2.5 4.3 2 β1.3Γ4.3 β 9.7 2 β Difference of Two Squares π π β π π
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Work out without a calculator: π.π π +π.πΓπ.π
Take out 2.5 as common (like we do in factorising by common factor) 2.5( ) 2.5(3) 2.5Γ3=7.5
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Work out without a calculator: π.π π βπ.πΓπ.π
Take out 4.3 as common (like we do in factorising by common factor) 4.3(4.3β1.3) 4.3(3) 4.3Γ3=12.9
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Work out without a calculator: π.ππ π β π.ππ π
Difference of Two Squares! 8.79 β 7.58Γ10 75.8
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Work out without a calculator: ππ.π π β π.π π
Difference of Two Squares! 10.3 β 0.6Γ20 12
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STP 9 MIXED EXERCISE Factorisng Quadratics HW
Pg 153 Exercise 7k No. 6 ONLY Exercise 7l No. 3 TO No.6
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