Factorise x2−12x−45 and find its value for x=3. [3 MARKS]
Find the value of k, if the line represented by the equation 3x – ky = 12 passes through the point (4,2). [2 MARKS]
Add t−t2−14, 15t3+13+9t−8t2, 12t2−19−24t and 4t−9t2+19t3. If t=−1 find the value of the expression. [4 MARKS]