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Expand and simplify (x – 9)(x + 2)

x^2 - 7x - 18

Answered by JOSEPH B. • Maths tutor

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A cuboid with a volume of 912cm^3 has the dimensions 4 cm, (x + 2) cm and (x + 9) cm. Find an equation in terms of x and solve to find the dimension.

Factorise: x^2+2x-3

How do I solve simultaneous equations using the substitution method?

Solve: 3x+5y=19 4x-2y=-18

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