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Answer to Credit revision Q 1

A. c. b. B. a. C. Answer to Credit revision Q 1. a b c sinA sinb sinC. =. =. Answer to Credit revision Q 2. (i) common factor (ii) difference of two squares (iii) trinomial (put in brackets). Answer to Credit revision Q 4.

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Answer to Credit revision Q 1

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  1. A c b B a C Answer to Credit revision Q 1 • a b c sinA sinb sinC = =

  2. Answer to Credit revision Q 2 • (i) common factor • (ii) difference of two squares • (iii) trinomial (put in brackets)

  3. Answer to Credit revision Q 4 • (i) decide on the 2 quadrants (cos is -ve) • (ii) ignore the sign and press INV cos to get angle • (iii) work out your 2 angles

  4. Answer to Credit revision Q 3 • tan x

  5. Answer to Credit revision Q 6 • 1

  6. y B(x2,y2) A(x1,y1) x Answer to Credit revision Q 5 • m = y2 – y1 x2 – x1

  7. A c b B a C Answer to Credit revision Q 8 • a2 = b2+c2-2bccosA

  8. C a b B A c Answer to Credit revision Q 7 • For ΔABC, right-angled at A, a2 = b2 + c2

  9. A c b B a C Answer to Credit revision Q 10 • cos A = b2 + c2 - a2 2bc

  10. Answer to Credit revision Q 9 • It means there is a root eg x = √ x 1 -- 2

  11. Answer to Credit revision Q 12 x = 5 x = 3 x = 5 x = 0 x = 1

  12. Answer to Credit revision Q 11 x2y + y2 xy xy = x + y x

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