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Solve by factorisation - OCR - GCSE Maths - Question 15 - 2019 - Paper 6

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Question 15

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Solve by factorisation. 5x² + 7x + 2 = 0 x = ......................... or x = .........................

Worked Solution & Example Answer:Solve by factorisation - OCR - GCSE Maths - Question 15 - 2019 - Paper 6

Step 1

Identify the equation to factorise

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Answer

The given quadratic equation is 5x² + 7x + 2 = 0.

Step 2

Factor the quadratic equation

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Answer

To factor the equation, we need two binomials that multiply to give us the quadratic. The equation can be factored as follows:

(5x+1)(x+2)=0.(5x + 1)(x + 2) = 0.

Step 3

Solve for x

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Answer

Using the zero product property, we set each factor to zero:

  1. 5x+1=05x + 1 = 0
    5x=15x = -1
    x=15x = -\frac{1}{5}

  2. x+2=0x + 2 = 0
    x=2x = -2

Thus, the solutions are:

x=15x = -\frac{1}{5} or x=2x = -2.

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