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factorise: 3x^2+13x-30

(3x-5)(x+6)factors of 90 (3x30): 1x90, 6x15, 9x10, 5x18and add up to 13 can only be 5 and 1818-5=13 5/3 or 18/3=6 and 5x6=30so must be (3x-5)(x+6) and check by expanding with FOIL method

Answered by Mary S. • Maths tutor

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factorise: 3x^2+13x-30

Related Maths GCSE answers

What is the value of x if x^2 - 3x +2=0?

Cosine theorem?

Calculate the area of a circle where the circumference of the circle and sides of the square are tangential at 4 points.

The line l is a tangent to the circle x^2 + y^2 = 40 at the point A. A is the point (2, 6). The line l crosses the x-axis at the point P. Work out the area of triangle OAP.

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