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

Question 15

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
Identify the equation to factorise

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

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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.
Solve for x

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Using the zero product property, we set each factor to zero:
-
5x+1=0
5x=−1
x=−51
-
x+2=0
x=−2
Thus, the solutions are:
x=−51 or x=−2.
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