Quadratic Equations

Quadratic Equations Quiz

Spec E2.5 · Cambridge IGCSE Maths: Quiz

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5 questions, one answer each

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  1. 1. Solve x2−7x+12=0x^2 - 7x + 12 = 0

    • A. x=3,x=4x=3, x=4
    • B. x=−3,x=−4x=-3, x=-4
    • C. x=2,x=6x=2, x=6
    • D. x=1,x=12x=1, x=12

  2. 2. Using the quadratic formula, what is b2−4acb^2-4ac for x2+2x−1=0x^2+2x-1=0?

    • A. 88
    • B. 00
    • C. 44
    • D. −4-4

  3. 3. Complete the square for x2−4x+1x^2 - 4x + 1

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

  4. 4. A student solves x2=9x^2 = 9 and writes only x=3x=3. What have they missed?

    • A. Nothing, this is correct
    • B. The negative solution x=−3x=-3
    • C. A factorisation step
    • D. The quadratic formula

  5. 5. Solve simultaneously: y=2xy = 2x and y=x2−3y = x^2 - 3

    • A. x=3,x=−1x=3, x=-1
    • B. x=−3,x=1x=-3, x=1
    • C. x=3,x=1x=3, x=1
    • D. x=−3,x=−1x=-3, x=-1

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