(3x+9) (7x+5)
21x^2 + 78x + 45
CA
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All answers ▸How do you factorise a quadratic equation?
P is a point on the circle with equation x^2 + y^2 = 80. P has x-coordinate 4 and is below the x-axis.Work out the equation of the tangent to the circle at P.
If A is divided by B, the result is 5/7. If B is divided by C, the result is 4/5. What is the result of A divided by C ?
Make d the subject of the formula: 3d + dxy = 4