Factorising quadratics with leading coefficient not 1

Factorising quadratics with leading coefficient not 1 Quiz

IB MYP Maths Extended: Quiz

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  1. 1. Factorise 3x2+10x+83x^2+10x+8.

    • A. (3x+4)(x+2)(3x+4)(x+2)
    • B. (3x+2)(x+4)(3x+2)(x+4)
    • C. (3x+8)(x+1)(3x+8)(x+1)
    • D. (3x−4)(x−2)(3x-4)(x-2)

  2. 2. Solve 2x2−x−6=02x^2-x-6=0.

    • A. x=2x=2 or x=−3x=-3
    • B. x=−2x=-2 or x=32x=\frac32
    • C. x=2x=2 or x=−32x=-\frac32
    • D. x=3x=3 or x=−2x=-2

  3. 3. Find the discriminant of 3x2−5x+4=03x^2-5x+4=0.

    • A. 7373
    • B. −23-23
    • C. 2525
    • D. −71-71

  4. 4. Use the formula to solve x2+3x−1=0x^2+3x-1=0 to 2 d.p.

    • A. x=0.30x=0.30 or x=−3.30x=-3.30
    • B. x=0.38x=0.38 or x=−3.38x=-3.38
    • C. x=0.62x=0.62 or x=−1.62x=-1.62
    • D. x=1.30x=1.30 or x=−4.30x=-4.30

  5. 5. The area of a rectangle is 3x2+7x−63x^2+7x-6 and its length is (x+3)(x+3). Find its width.

    • A. (3x+2)(3x+2)
    • B. (3x−3)(3x-3)
    • C. (x−2)(x-2)
    • D. (3x−2)(3x-2)

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